Data as of Oct 5, 2026Based on 367 AI responses from ChatGPT Search and Google AI Mode
Reviewed by Dimitry Apollonsky ·
Pick the product that matches your use: Solarmeter Model 6.5 (Solar Light) for precise UVB and UV index checks like reptile lamps; Shade/Wearshade radiometers for wearable, skin‑health monitoring; ILT800 for UV curing and sterilization logging; PerkinElmer LAMBDA 25 for lab-grade spectrophotometry; SparkFun or Adafruit modules for Arduino/RPi hobby and embedded projects.
Brands AI recommends here
Mentioned inRecommended in · Sep 13 – Sep 29, 2026
Google AI ModeSep 29, 2026
The best UV sensor depends entirely on your specific application , balancing budget, precision, and whether you need hobbyist prototyping or professional meteorological monitoring.
| Sensor Model | Best For | Price Range | Key Features |
|---|---|---|---|
| Adafruit LTR390 UV Light Sensor | Best low-cost general & hobbyist use | ~$5.00 | True UVA + ambient light sensing, I2C/STEMMA QT, internal ADC |
ChatGPT SearchSep 29, 2026
Google AI ModeSep 25, 2026
Google AI ModeSep 21, 2026
The "best" UV sensor depends heavily on your project requirements—whether you need simple analog voltage reading, precise digital I2C UV index tracking, or broad spectrum light sensing.
The top options break down by use case:
Google AI ModeSep 17, 2026
The "best" UV sensor depends entirely on your project's requirements—whether you need precision digital readings, simple analog plug-and-play behavior, or multi-spectrum tracking.
Google AI ModeSep 13, 2026
48% of citations to these sources link to brands' own websites.
wearshade.com
wearshade.com
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Shade UV sensor Reviews (opens in a new tab)Brand site2%wearshade.com
UV Monitoring Sensors: A Must-Have for Weather Enthusiasts — Davis Instruments (opens in a new tab)Brand site1%davisinstruments.com
| Best multi-spectrum / precise lab use |
| ~$33.00 |
| Dedicated UVA, UVB, and UVC channels, high dynamic range |
| Davis Instruments UV Sensor 6490 | Best professional weather station use | ~$425.00 | Erythema spectral response, convection-cooled housing, outdoor ruggedness |
To help narrow down the best choice, tell me:
If you mean UV sensors for an electronics project (Arduino, ESP32, Raspberry Pi, etc.), there isn't one universally “best” sensor—the right choice depends on whether you need UV Index, UVA/UVB, or spectral measurement.
$13.16
$12.49
$4.00
Best overall for most projects: LTR390-UV-01
Best if you specifically need separate UVA + UVB: VEML6075. It has dedicated UVA and UVB sensing and calibration intended for UV-Index calculations. However, the VEML6075 has been discontinued by Vishay, so I wouldn't choose it for a new design unless you specifically need its characteristics.
For serious spectral UV measurement: I'd look at the AS7331, which provides separate UVA, UVB, and UVC channels. That's a substantially different class of sensor from the inexpensive hobby modules.
| Sensor | Best suited for |
|---|---|
| LTR390 | ⭐ General UV monitoring / ESP32 / weather station |
| VEML6075 | UVA + UVB / UV Index |
| AS7331 | UVA + UVB + UVC / more serious measurement |
| GUVA-S12SD | Very cheap analog UV detection |
| SI1145 | Approximate UV Index, not direct UV measurement |
If you tell me what you're measuring (sunlight, UV-C lamp, UV sterilizer, reptile lamp, 3D-printer curing, etc.) and your microcontroller, I can narrow it down to the specific sensor and breakout board I'd use.
The "best" UV sensor depends heavily on your project's requirements, such as whether you need simple analog readings, precise digital UV index values, or low power consumption for a weather station or wearable.
The top-rated UV sensors on the market categorized by use case include:
GUVA-S12SD (Best for Simple DIY / Analog Projects)
LTR390-UV (Best for Modern Digital & Precision UV Index)
Si1145 (Best Multi-Function / Ambient Light + UV)
To help me recommend the exact right sensor for you, tell me:
If you mean an electronic UV sensor for an Arduino/ESP32/Raspberry Pi project, the choice depends on what you want to measure:
Best general-purpose choice: LTR390-UV-01 — digital I²C, low cost, wide UV response, and also measures ambient light. It’s a particularly good fit for weather stations and outdoor monitoring.
Adafruit LTR390 UV Light Sensor - $5.30 (Pimoroni Ltd)
Best for UVA/UVB differentiation: VEML6075 — has separate UVA and UVB channels and 16-bit digital output. However, independent testing found significant angular-response and calibration issues, so it shouldn't be treated as a precision radiometer without calibration.
Best for UVA/UVB/UVC spectral information: AS7331 — a more sophisticated three-channel sensor. This is the direction I'd look if you need to distinguish different UV bands rather than simply estimate UV intensity.
Best cheap analog option: ML8511 — simple and easy to interface, but its response extends into visible wavelengths, making it less suitable when measurement accuracy matters.
For a new DIY design, I'd start with the LTR390. For example, the DFRobot version provides I²C/UART and covers roughly 280–430 nm.
If you tell me what UV source you're measuring (sunlight/UV index, 365 nm LEDs, 395 nm LEDs, UV-C at 254 nm, etc.) and your microcontroller, I can recommend the specific sensor and breakout board.
If you mean UV sensors for an electronics project, there isn't one universal “best”—it depends on whether you need UV Index, UVA/UVB/UVC measurement, or simply UV intensity.
Best for UV Index / sunlight: VEML6075 — measures UVA and UVB separately, has 16-bit I²C output, and is specifically designed for UV Index calculations.
Best current general-purpose choice: LTR390 — inexpensive, digital I²C, measures UV and ambient light, and is straightforward to use with Arduino/ESP32/Raspberry Pi.
Best if you need actual UVA/UVB/UVC spectral channels: AS7331 — more appropriate when distinguishing different UV bands matters.
Best cheap analog sensor: GUVA-S12SD — simple analog output and roughly 240–370 nm response, but less convenient/precise than the digital sensors.
LTR390 UV Light Sensor - $17.20 (newegg.com)
Waveshare LTR390 UV Sensor - $35.99 (newegg.com)
GUVA-S12SD Analog UV Sensor - $8.41 (The Pi Hut)
If I were building a new Arduino/ESP32 weather or sunlight monitor today, I'd generally choose the LTR390. The VEML6075 remains attractive for UV-Index applications, but some breakout boards are now discontinued.
If you tell me what you're measuring (sunlight/UV Index, UV-C lamp, reptile lamp, resin curing, etc.) and your microcontroller, I can recommend the specific sensor and module.
Type: Digital (I²C)
Wavelength Range: UVA (300-350 nm) + Ambient Light Sensing (500-600 nm)
Why it’s great: It features a modern I²C interface, excellent low-light sensitivity, built-in ambient light rejection, and support for Adafruit's STEMMA QT / Qwiic ecosystem for plug-and-play chaining without soldering.
Type: Analog Voltage Output
Wavelength Range: 240-370 nm (UVA and UVB)
Why it’s great: Available as a breakout from Adafruit Analog UV Sensor Breakout or DFRobot Gravity UV Sensor . It outputs a clean linear analog voltage directly proportional to UV intensity (𝑉𝑜=4.3×D i o d e-C u r r e n t i n𝜇A ). It requires zero configuration or complex libraries—just read the analog pin and convert it to a UV index.
Type: Digital (I²C)
Wavelength Range: UVA and UVB with dedicated UV index output
Why it’s great: It explicitly measures UVA and UVB light separately and processes it using a specialized formula to give a direct, highly accurate numerical UV Index value rather than raw light intensity.[2][3]
If you want to narrow down the choice, tell me:
The top-rated UV sensors on the market for DIY electronics, weather stations, and microcontrollers break down by use case:
To help narrow down which one you should pick, tell me:
If you mean an electronic UV sensor for an Arduino/ESP32/Raspberry Pi project, the LTR390-UV-01 is a strong choice for most new designs. It has digital I²C output, measures UV plus ambient light, and has a broad UV response around 280–430 nm.
If you tell me what you're measuring—sunlight/UV Index, UV-C sterilization, a 365–405 nm UV LED, reptile lighting, plant lighting, etc.—I can tell you which sensor is actually the right one.
The best UV sensor depends entirely on your use case, ranging from microcontrollers and DIY electronics to professional weather stations and industrial testing.
| Sensor / Model | Best For | Price Range | Key Feature |
|---|---|---|---|
| Adafruit LTR-390 | DIY, Arduino, & Raspberry Pi projects | ~$5 | True UVA & ambient light sensing with internal ADC and I2C |
| AMS AS7331 Breakout | Multi-band spectral UV tracking (UVA, UVB, UVC) | ~$36 | High dynamic range with absolute radiometric fluence outputs |
| Davis 6490 | Weather stations & long-term outdoor monitoring | ~$340–$425 | Erythema spectral response matching human health concerns |
| General Tools UV513AB | Professional field spot-checking (UVA/UVB) | ~$100–$200 | Handheld digital meter with external probe for precise intensity tests |
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Best for Makers and General Use: The Adafruit LTR390 UV Light Sensor is an exceptional low-cost choice. Unlike older analog sensors or crude approximations (like the Si1145), it features a true digital I2C interface, integrated analog-to-digital conversion, and broad compatibility with STEMMA QT/Qwiic connectors for easy plug-and-play wiring.
Best for Advanced / Scientific Measurement: The AMS AS7331 Breakout stands out by splitting readings into separate UVA, UVB, and UVC channels. It provides absolute calibrated fluence measurements (μW/cm²) rather than relative indexes, making it ideal for precision environmental logging or UV LED testing.
Best for Weather Tracking: The Davis Instruments UV Sensor (6490) is built explicitly for permanent outdoor weather stations (such as the Vantage Pro2). It matches the Erythema Action spectrum to gauge sunburning risk accurately and includes convection-cooled housing to prevent false high readings from solar heat buildup.[1][2][3]
Are you looking for a sensor to connect to a microcontroller (like Arduino/ESP32) , an outdoor weather station , or a handheld meter for spot testing?
If you mean an electronic UV sensor for an Arduino/ESP32/Raspberry Pi project, my pick is:
If I were building one today: LTR390 for a normal UV meter → AS7331 if accuracy/spectral information matters.
If you tell me what you're measuring (sunlight/UV Index, UV-C lamp, 365-nm LED, reptile lamp, resin curing, etc.), I can recommend the specific sensor and breakout board—the best choice changes quite a bit by application.
