Data as of Sep 9, 2026 · Based on 52 AI responses from ChatGPT Search and Google AI Mode · See how Parse measures this
Brands AI recommends here
Named in 54% of answers
Named in 38% of answers
Named in 33% of answers
Named in 29% of answers
Source | Citation share |
|---|---|
HandiTrase – Soilmoisturehttps://soilmoisture.com/product-line/soil-sensors/handitrase/ | 3.4% |
360 SOILSCAN | 360 Yield Centerhttps://www.360yieldcenter.com/products/360-soilscan/ | 2.7% |
Innovative Handheld Soil Moisture Meter Revolutionizes Greenhouse And Potted Plant Carehttps://innoquestinc.com/innovative-handheld-soil-moisture-meter-revolutionizes-greenhouse-and-potted-plant-care/ | 1.5% |
Saturn Soilsense | The Soil Nutrient Infrastructure for Physical AIhttps://www.saturnsoilsense.com/ | 1.5% |
360 SOILSCAN | 360 Yield Centerhttps://www.360yieldcenter.com/products/360-soilscan/ | 1.3% |
 Electronic NPK Soil Testers?https://www.reddit.com/r/SoilScience/comments/1usfeh6/electronic_npk_soil_testers/ | 1.0% |
 Field evaluation of portable soil water content sensors in a sandy loam - Kim - 2020 - Vadose Zone Journal - Wiley Online Libraryhttps://acsess.onlinelibrary.wiley.com/doi/10.1002/vzj2.20033 | 0.8% |
 HS2 | Products | Campbell Scientifichttps://www.campbellsci.com/products/hs2 | 0.8% |
 Soil Nitrate Measurement for Determination of Plant-Available ...https://www.horiba.com/int/water-quality/applications/agriculture-crop-science/soil-nitrate-measurement-for-determination-of-plant-available-nitrogen/ | 0.8% |
LAQUAtwin NO3-11C/NO3-11S/NO3-11 - HORIBAhttps://www.horiba.com/int/water-quality/products/detail/action/show/Product/laquatwin-no3-11c-no3-11s-no3-11-794/ | 0.8% |
If you mean **professional field instruments for agriculture, research, or precision fertilization** (rather than inexpensive garden meters), the vendors below are among the stronger options for measuring **soil nitrate (NO₃⁻/NO₃-N)** and **soil moisture** in the field. The best choice depends on whether you need…
If you mean professional field instruments for agriculture, research, or precision fertilization (rather than inexpensive garden meters), the vendors below are among the stronger options for measuring soil nitrate (NO₃⁻/NO₃-N) and soil moisture in the field. The best choice depends on whether you need direct nitrate measurement or a fast nutrient-management estimate.
| Vendor / device family | Nitrate capability | Moisture capability | Field accuracy considerations |
|---|---|---|---|
| 360 Yield Center — 360 SOILSCAN | Portable nitrate testing (soil extract-based) | Not primarily a moisture sensor | Designed for in-field nitrate decisions; manufacturer positions it as giving results comparable to traditional soil lab testing, though independent validation should be checked for your soil type. [360 Yield Center |
| Hanna Instruments — portable nitrate meters | Nitrate measurement from soil extracts/samples | Separate moisture instruments available | Good for quick field sampling workflows; ion-selective electrode (ISE) methods require calibration and careful sample preparation. ARS |
| Spectrum Technologies — FieldScout / soil sensor products | Some nutrient testing products use nitrate-related measurements; stronger reputation is in soil moisture instrumentation | Strong handheld moisture options | Widely used for soil moisture monitoring; portable electromagnetic moisture sensors generally perform well when calibrated for local soils. ACSESS |
| Soilmoisture Equipment Corp. — HandiTrase TDR | No nitrate | Excellent volumetric water content measurement | HandiTrase uses TDR technology and is specified for volumetric water content with reported accuracy around ±2% of full scale. Soilmoisture |
| Delta-T Devices — ThetaProbe / ML3 | No nitrate | High-quality soil moisture measurement | Used extensively in research; field studies compare it favorably with other electromagnetic moisture probes, though site-specific calibration improves results. ACSESS |
| Aquamonitrix | Portable nitrate/nitrite analysis | Not a soil moisture probe | A portable ion chromatograph approach has shown close agreement with conventional laboratory ion chromatography in field soil and pore-water applications. ScienceDirect |
Most reliable soil moisture measurement:
Soilmoisture Equipment Corp. HandiTrase TDR
Delta-T Devices ThetaProbe systems These are based on established dielectric measurement methods rather than simple conductivity probes.
Most practical nitrate scouting in farms:
360 Yield Center 360 SOILSCAN
Portable nitrate ISE meters such as those from Hanna Instruments These are better suited to collecting many field samples quickly than trying to permanently measure nitrate continuously.
Research-grade nitrate measurement:
Portable ion chromatography systems such as Aquamonitrix can provide higher analytical confidence, but they are more complex and expensive.
Continuous in-soil nitrate probes are still a difficult category. Independent evaluations have found that some commercial nitrate probes perform well in solution but lose sensitivity or show bias when placed directly in soil because of effects from moisture, salinity, and soil chemistry.
For a farm decision system, a common high-confidence setup is:
If you tell me your application (row crops, greenhouse, research plot, turf, etc.), target nitrate range, and budget, I can narrow this to specific models.
Measuring both **nitrate** (N O 3−cap N cap O sub 3 raised to the negative power𝑁𝑂−3 ) and **moisture** accurately in the field with a single portable device is chemically and electronically challenging. `Direct insertion probes` that claim to measure NPK (Nitrogen, Phosphorus, Potassium) simultaneously via simple…
Measuring both nitrate (N O 3−cap N cap O sub 3 raised to the negative power𝑁𝑂−3 ) and moisture accurately in the field with a single portable device is chemically and electronically challenging. Direct insertion probes that claim to measure NPK (Nitrogen, Phosphorus, Potassium) simultaneously via simple metal prongs in raw soil generally offer low scientific accuracy for mobile nitrate testing because nitrate ions require aqueous extraction or selective ion-electrode measurement to be quantified reliably.
For true field accuracy, professionals typically separate moisture measurement (using high-frequency capacitance/FDR probes) from nitrate measurement (using ion-selective electrode meters or rapid colorimetric extraction kits).
Top vendors and device options categorized by field-testing reliability include:
If you'd like, let me know:
I can help narrow down the exact budget and workflow that fits your needs.
Measuring **nitrate** and **moisture** accurately in the field requires separating scientific-grade ion-selective tools from cheap generic "3-in-1" garden spikes (which are notoriously inaccurate for chemical nutrients). True field-portable accuracy for nitrate requires either an Ion-Selective Electrode (ISE) or…
Measuring nitrate and moisture accurately in the field requires separating scientific-grade ion-selective tools from cheap generic "3-in-1" garden spikes (which are notoriously inaccurate for chemical nutrients). True field-portable accuracy for nitrate requires either an Ion-Selective Electrode (ISE) or colorimetric extraction, paired with a dedicated capacitive or TDR/FDR moisture sensor.
The most reliable vendors and device options for accurate field testing include:
If you share your budget range and whether this is for home gardening, commercial farming, or turf management , I can narrow down whether a pocket ISE meter (like Horiba) or a direct-insertion TDR probe fits your workflow best.
No sources cited
If you mean **professional field instruments where nitrate and soil moisture accuracy actually matters**, I would narrow the field considerably. Most inexpensive “NPK + moisture” handhelds do **not** have strong independent accuracy specifications for nitrate. ### Best vendors/instrument options Vendor / instrument |…
If you mean professional field instruments where nitrate and soil moisture accuracy actually matters, I would narrow the field considerably. Most inexpensive “NPK + moisture” handhelds do not have strong independent accuracy specifications for nitrate.
| Vendor / instrument | Nitrate in field | Soil moisture | Accuracy evidence | My take |
|---|---|---|---|---|
| HORIBA LAQUAtwin NO3-11S | Yes — nitrate/NO₃-N from soil extract | No | ±10% of actual value for nitrate | Best portable nitrate choice |
| SoilMoisture Equipment HandiTrase | No | Yes, TDR | ±2% or better of full scale | Excellent dedicated moisture instrument |
| FieldScout TDR 150 (Spectrum Technologies) | No | Yes, TDR | ±3% VWC under specified EC conditions | Strong field moisture option |
| TerraBlaster Blaster 1000 | Yes — nitrate-N | Yes | Vendor claims direct laser-based measurement, but I would demand validation data before relying on it for agronomic decisions | Interesting single-platform option |
HORIBA is particularly credible for nitrate because its LAQUAtwin NO3-11S is specifically configured for soil extracts, with lower-concentration calibration standards. HORIBA's published specification gives a nitrate measurement range of 6–9,900 ppm and ±10% accuracy. Its recommended soil workflow involves extracting nitrate from a soil sample rather than simply inserting the probe into undisturbed soil.
For moisture, SoilMoisture Equipment's HandiTrase is one of the stronger choices if accuracy is the priority: it uses TDR, measures volumetric water content to 40 cm, and specifies ±2% or less of full-scale accuracy. Soilmoisture The FieldScout TDR 150 is another well-established option, specifying ±3% VWC when soil EC is below 2 mS/cm.
The most interesting candidate I found is TerraBlaster's Blaster 1000. The manufacturer lists both nitrate-N and moisture among its measurements, alongside P, K, pH, EC, organic matter, etc.
However, I would not automatically rank it above the two-instrument approach. For a research, consulting, or precision-agriculture application, I'd ask TerraBlaster for independent validation against laboratory nitrate analysis and gravimetric/TDR moisture measurements across your soil types before purchasing.
One important distinction: nitrate measurement and moisture measurement are fundamentally different problems. A good nitrate field workflow generally extracts nitrate into solution and measures it with an ion-selective electrode, whereas high-quality soil-moisture instruments commonly use TDR. So a two-instrument setup can actually be substantially more defensible than a cheap all-in-one meter.
If you tell me your budget (e.g. <$1,000, $1–5k, or $5k+) and whether this is for row crops, turf, greenhouse, or research, I can narrow this to 3–5 specific instruments and compare accuracy, detection range, sample preparation, price, and U.S. availability.
The most interesting candidate I found is TerraBlaster's Blaster 1000. The manufacturer lists both nitrate-N and moisture among its measurements, alongside P, K, pH, EC, organic matter, etc.
However, I would not automatically rank it above the two-instrument approach. For a research, consulting, or precision-agriculture application, I'd ask TerraBlaster for independent validation against laboratory nitrate analysis and gravimetric/TDR moisture measurements across your soil types before purchasing.
When searching for portable field devices that can accurately measure both **nitrate** and **moisture** , you encounter a technological split: *moisture* is easily measured via direct burial/insertion probes (using Time-Domain Reflectometry or capacitance), whereas *nitrate* ions require an aqueous solution or a…
When searching for portable field devices that can accurately measure both nitrate and moisture , you encounter a technological split: moisture is easily measured via direct burial/insertion probes (using Time-Domain Reflectometry or capacitance), whereas nitrate ions require an aqueous solution or a chemical extraction process to measure accurately. Cheap all-in-one "NPK" metal spikes plugged directly into dry soil are notoriously inaccurate for chemical ions like nitrate.
The most reliable vendors and systems divided by their field capabilities include:
If you share your budget range and whether you need strict scientific/lab-grade data or just general garden/crop monitoring , I can recommend the most practical hardware configuration.
If you mean **professional field instruments** rather than inexpensive garden probes, the market is surprisingly narrow. The strongest option I found for **direct field nitrate measurement** is HORIBA; for **soil moisture**, dedicated TDR/FDR probes are generally more defensible than combination “soil nutrient”…
If you mean professional field instruments rather than inexpensive garden probes, the market is surprisingly narrow. The strongest option I found for direct field nitrate measurement is HORIBA; for soil moisture, dedicated TDR/FDR probes are generally more defensible than combination “soil nutrient” meters.
| Vendor / device | Nitrate | Moisture | Field suitability | My take |
|---|---|---|---|---|
| HORIBA LAQUAtwin NO3-11S | Yes — direct nitrate/NO₃-N | No | Excellent | Best portable nitrate choice |
| FieldScout TDR (Spectrum Technologies) | No | Yes — TDR | Excellent | Best portable moisture choice |
| Sentek Drill & Drop | No | Yes — FDR | Excellent | Excellent for profiling moisture by depth |
| MSE PRO multi-parameter instruments | Some nutrient configurations | Yes, depending on configuration | Good | Worth investigating for an integrated system |
| Cheap 3-/4-in-1 garden meters | Usually only vague “nutrient” indication | Yes | Good for casual use | Not recommended for quantitative nitrate work |
The LAQUAtwin NO3-11S is specifically intended for soil and uses an ion-selective electrode. HORIBA specifies a nitrate range of 6–9,900 ppm and nitrate-N range of 1.4–2,200 ppm, with stated accuracy of approximately ±10% after calibration. It's IP67 and weighs only about 55 g, making it genuinely field-portable.
There is an important caveat: “field portable” doesn't mean you simply stick it into undisturbed soil and get a lab-equivalent nitrate result. HORIBA's soil procedure calls for extracting the soil, generally at a 1:5 soil-to-water/extractant ratio, settling/filtering it, then measuring the clear extract. Soil moisture, chloride, conductivity, suspended solids and sunlight can affect results.
So I'd regard it as highly useful for rapid field nitrate screening/quantification, provided you standardize the extraction protocol.
For moisture, I'd pair the nitrate meter with a FieldScout TDR rather than trying to find a single inexpensive instrument that claims to measure everything. TDR is a much more established approach for quantitative soil volumetric water-content measurements.
The portable FieldScout TDR instruments are explicitly designed for field use and are marketed for accurate measurements across the soil-moisture range. Spectrum Technologies
Sentek is particularly interesting if your field work requires soil-water profiles, rather than one-off surface readings. Its Drill & Drop probes measure moisture and temperature at multiple depths and are installed into relatively undisturbed soil, which can give a more representative profile than slurry-based measurements.
For agronomic field sampling where nitrate accuracy matters, my preferred setup would be:
I would not select a generic $50–$150 “4-in-1 soil nutrient/moisture/pH” meter for quantitative nitrate work. Those products generally don't provide the kind of nitrate-specific measurement principle, calibration information, and accuracy specification that HORIBA provides.
If you tell me your target nitrate range (e.g., 0–100, 0–500, or 0–2,000 ppm), soil type, and whether you need volumetric water content (%) or simply a relative moisture reading, I can narrow this to 3–5 commercial instruments with accuracy, price, sample-prep requirements, and U.S. vendors.
The portable FieldScout TDR instruments are explicitly designed for field use and are marketed for accurate measurements across the soil-moisture range. Spectrum Technologies
Accurate field-level measurement of both **nitrate (N O 3−cap N cap O sub 3 raised to the negative power𝑵𝑶−𝟑)** and **soil moisture** requires distinct or specialized `multi-parameter instrumentation` , as cheap all-in-one analog metal probes fail to reliably quantify active nitrate ions.[1][2] | Vendor & Device |…
Accurate field-level measurement of both nitrate (N O 3−cap N cap O sub 3 raised to the negative power𝑵𝑶−𝟑) and soil moisture requires distinct or specialized multi-parameter instrumentation , as cheap all-in-one analog metal probes fail to reliably quantify active nitrate ions.[1][2]
| Vendor & Device | Parameters Measured | Approx. Price | Field Accuracy / Method |
|---|---|---|---|
| Horiba (LAQUAtwin NO3-11 Meter) | Nitrate ion (N O 3−cap N cap O sub 3 raised to the negative power𝑁𝑂−3 ) / Nitrate-Nitrogen (N O 3−−N cap N cap O sub 3 raised to the negative power minus cap N𝑁𝑂−3−𝑁) | $375 - $450 | ±𝟏𝟎% actual value using flat-sensor Ion Selective Electrode (ISE) technology requiring a small soil-water extract. |
| Spectrum Technologies | |||
| (FieldScout TDR series) | Soil Moisture (% VWC), EC, Temperature | $600 - $1,500+ | ±𝟑% VWC soil moisture accuracy using time-domain reflectometry (TDR) proven for professional turf and ag fields. |
| Stevens Water | |||
| (Hydra Probe) | Moisture (% VWC), Electrical Conductivity, Temperature | $500 - $900 | High-precision dielectric permittivity sensor for robust, multi-parameter real-time volumetric water content. |
| Environmental / Generic 7-in-1 / 8-in-1 Kits Go to product viewer dialog for this item. (Tilswall Portable Soil Tester) | Moisture, NPK (Estimation), pH, Temp | $68 - $500+ | Low-to-moderate accuracy for NPK; direct electrochemical insertion probes estimate relative ionic activity rather than rigorous lab-grade nitrate extraction. |
Field Testing Best Practices
If you share your budget range and whether you need this for row crops, turfgrass, or horticulture , I can help narrow down the ideal combination kit or specific meter.
If your priority is **field accuracy for both nitrate and soil moisture**, the shortlist is surprisingly small. Many inexpensive “NPK + moisture” meters claim both, but I would not treat those claims as validated nitrate measurements. ### Best-supported vendors Vendor / device | Nitrate | Moisture | Field-accuracy…
If your priority is field accuracy for both nitrate and soil moisture, the shortlist is surprisingly small. Many inexpensive “NPK + moisture” meters claim both, but I would not treat those claims as validated nitrate measurements.
| Vendor / device | Nitrate | Moisture | Field-accuracy evidence | My take |
|---|---|---|---|---|
| Stenon FarmLab | NO₃ and Nmin | Yes | Strongest direct evidence: DLG testing found it met their accuracy requirements for NO₃, Nmin and soil moisture. DLG e.V. Stenon | Best single-device choice |
| Proximal SoilSens NutriSensX + TerraPort | Nitrate | Yes, via TerraPort | NutriSens nitrate performance has independent comparative evidence; TerraPort is the company's portable moisture platform. SoilSens SoilSens PubMed Central (PMC) | Worth evaluating, especially in India |
| HORIBA LAQUAtwin NO3-11S + separate moisture probe | Direct NO₃/NO₃-N | No | HORIBA specifies ±10% accuracy for nitrate; independent field work has also found good correlation for portable nitrate meters under suitable conditions. HORIBA HERO | Excellent nitrate instrument, but two-device solution |
| **Aquamonitrix portable IC | NO₃/NO₂ | Not a soil-moisture meter | A 2024 peer-reviewed field study found nitrate results closely agreed with conventional ion chromatography, with soil-analysis RSDs below 10%. ScienceDirect PubMed | Highest analytical confidence, but more of a portable lab than a handheld soil probe |
For your exact question, Stenon FarmLab is the strongest match. The German Agricultural Society (DLG) specifically evaluated the device for NO₃ content, Nmin content and soil moisture, and concluded that it met its required prediction accuracy for all three.
That's considerably more convincing than a vendor simply saying “high accuracy.”
I would be careful with generic handheld devices advertising N-P-K + moisture for a few hundred dollars or less. An independent comparison of commercial nitrate probes from Nutrisens, RIKA and JXCT found that only Nutrisens showed coherent, accurate nitrate behavior in the soil/sand tests; RIKA and JXCT performed much better in liquid than in the soil matrix.
Also, nitrate accuracy is strongly affected by soil EC, moisture, extraction method and soil type. So a device can be accurate in a calibration solution while being poor at measuring actual soil nitrate.
Bottom line:
If you tell me your budget (e.g. <$1k, $1–5k, or $5k+) and whether you need direct in-soil measurement vs. soil-extract nitrate, I can narrow this to 3–5 specific models and compare accuracy, detection range, calibration, and U.S. availability.
For your exact question, Stenon FarmLab is the strongest match. The German Agricultural Society (DLG) specifically evaluated the device for NO₃ content, Nmin content and soil moisture, and concluded that it met its required prediction accuracy for all three.
That's considerably more convincing than a vendor simply saying “high accuracy.”
I would be careful with generic handheld devices advertising N-P-K + moisture for a few hundred dollars or less. An independent comparison of commercial nitrate probes from Nutrisens, RIKA and JXCT found that only Nutrisens showed coherent, accurate nitrate behavior in the soil/sand tests; RIKA and JXCT performed much better in liquid than in the soil matrix.
Also, nitrate accuracy is strongly affected by soil EC, moisture, extraction method and soil type. So a device can be accurate in a calibration solution while being poor at measuring actual soil nitrate.
Bottom line:
Several portable field devices and `handheld meters` test for both **soil moisture and nitrogen (nitrate/NPK)** , though direct electrochemical field measurement of active nitrate relies on broad-spectrum ion-selective electrodes or general NPK/EC proxy sensors rather than absolute lab precision. Top Portable Soil…
Several portable field devices and handheld meters test for both soil moisture and nitrogen (nitrate/NPK) , though direct electrochemical field measurement of active nitrate relies on broad-spectrum ion-selective electrodes or general NPK/EC proxy sensors rather than absolute lab precision.
Top Portable Soil Testing Vendors
Yieryi : Offers handheld multi-parameter rapid test platforms and probes measuring moisture/humidity alongside NPK (Nitrogen, Phosphorus, Potassium) and pH.[1]
Add to listTilswall : Provides a budget-friendly [Tilswall Portable Soil Tester Go to product viewer dialog for this item. ](https://www.tilswall.com/products/tilswall-8-in-1-npk-soil-sensor-probe-multi-parameter-tester-analyzer?srsltid=AfmBOoqJPS0a3XDFHHsaTD36Nas3m1VBkdujDdooc7LeMS57CiCkE8uPlXM) that connects via an app to monitor NPK, moisture, temperature, and pH using stainless steel probes.[1]
Add to listLowe's : Carries industrial-grade multi-parameter kits like the [KHKFY 7-in-1 Soil Tester Kit Go to product viewer dialog for this item. ](https://www.lowes.com/pd/KHKFY-7-in-1-Soil-Tester-Kit-LCD-Display-Measures-pH-Moisture-Temperature-Conductivity-Nitrogen-Phosphorus-Potassium-Data-Storage-for-Agriculture/5020900101?user=shopping&feed=yes&srsltid=AfmBOoryfCXGoJrIutyaqlMn1mQ9KAC_AtUESjij7GNBTNUef07B88q9lKs) which features direct digital readouts and data logging for nitrogen and moisture.[1]
Quick Comparison of Field Testing Options
| Vendor / Product | Key Measurements | Display & Data Export | Approximate Price |
|---|---|---|---|
| Tilswall 8-in-1 Go to product viewer dialog for this item. | Moisture, NPK, pH, Temp, EC | Mobile App (Excel export) | $80 |
| Yieryi Pro Platform Go to product viewer dialog for this item. | Moisture, NPK, pH, Temp, EC | 2.8" LCD & PC USB export | $475 |
| KHKFY 7-in-1 Kit Go to product viewer dialog for this item. | Moisture, NPK, pH, Temp, EC | Full-color LCD & PC export | $642 |
If you'd like, let me know:
I can help narrow down the best specific device for your workflow.
No sources cited
If **field accuracy for both nitrate and moisture** is the priority, the market is narrower than the many inexpensive “NPK soil meters” suggest. I’d separate the options into **true field nitrate systems** and **high-accuracy moisture meters paired with a nitrate test**. Vendor / device | Nitrate in soil | Moisture |…
If field accuracy for both nitrate and moisture is the priority, the market is narrower than the many inexpensive “NPK soil meters” suggest. I’d separate the options into true field nitrate systems and high-accuracy moisture meters paired with a nitrate test.
| Vendor / device | Nitrate in soil | Moisture | Field suitability | My take |
|---|---|---|---|---|
| 360 Yield Center — 360 SOILSCAN | Yes; soil nitrate/N availability | Not its primary measurement | Excellent | Best practical choice for rapid field nitrate testing |
| Nutrisens | Yes, direct nitrate sensing | Depends on configuration | Good | Most promising direct nitrate-sensor technology |
| Teralytic | Yes, continuous nitrate sensing | Yes | Excellent | Interesting for continuous monitoring, but field validation shows some systematic bias |
| SoilMoisture — HandiTrase | No | Yes, TDR; ±2% full scale | Excellent | Best high-confidence portable moisture option |
| Campbell Scientific — HydroSense II | No | Yes; portable VWC | Excellent | Strong professional/research option |
| Delta-T / Dynamax ThetaProbe ML3 | No | Yes; research-grade | Excellent | Excellent moisture measurement, but requires separate nitrate method |
| HORIBA LAQUAtwin NO3 | Nitrate in extracted samples | No | Excellent | Very portable nitrate measurement, but it's a sample/extract measurement rather than an in-situ soil probe |
For nitrate, I would be cautious about inexpensive probes advertised as “NPK sensors.” An independent comparison of commercial nitrate probes from Nutrisens, RIKA and JXCT found substantial differences: Nutrisens was the only one that produced coherent/accurate measurements across the tested conditions, while the other two showed very weak sensitivity in sand.
360 SOILSCAN takes a different approach: you collect a soil sample, make a soil-water slurry, and measure nitrate in roughly five minutes. The manufacturer describes its results as comparable in accuracy to a traditional soil lab.
For moisture, the evidence is much stronger. A field comparison of 16 portable moisture probes found that commonly used systems—including Delta-T ThetaProbe, Stevens HydraProbe, Spectrum TDR100, Campbell HydroSense II and IMKO TRIME-PICO64—could achieve RMS errors below 0.025 m³/m³ after site-specific correction.
My shortlist would therefore be:
Bottom line: If you need defensible nitrate numbers for fertilizer decisions rather than just a relative “N level,” I'd favor a portable nitrate extraction/analyzer such as 360 SOILSCAN or LAQUAtwin + a high-quality TDR moisture probe, rather than relying on a single cheap NPK probe.
If you tell me your crop, target nitrate range (ppm NO₃-N), soil type, and budget, I can narrow this to 3–5 specific vendors/models and compare their published accuracy, calibration requirements, price, and field workflow.
For moisture, the evidence is much stronger. A field comparison of 16 portable moisture probes found that commonly used systems—including Delta-T ThetaProbe, Stevens HydraProbe, Spectrum TDR100, Campbell HydroSense II and IMKO TRIME-PICO64—could achieve RMS errors below 0.025 m³/m³ after site-specific correction.
My shortlist would therefore be:
