Recommendations: The solar radiation measured by this product includes both direct and diffuse radiation. Suitable for outdoor UV index measurement. The measured reading is the average of the illumination intensity for the area. Please keep the photosensitive device clean. For cleaning, wipe with alcohol and cotton gauze. Do not clean the photosensitive device with sharp objects to prevent damage to the front filter.Do not place the instrument in a high temperature, high humidity and dusty environment.Operation Before measuring, please keep from obstacles such as buildings, trees, etc. block sunlight. With the arm straight so the radiometer is perpendicular to the ground, with the sensor facing up, press the button to take the measurement.Under various weather conditions, the UVI index varies greatly, please take the average of multiple measurements to reduce errors. This product is powered by 3V DC, and comes with two AA batteries. If you do not it for a long time, please take out the batteries to avoid leakage and damage to the radiometer.ApplicationsReal-time UV Index MeasurementUV index comparisonUV Index Tracking DetectionFeaturesImported sensors are , integrated filters, and have good cut-off characteristics.Calibration by East China Metrology Institute, small measurement errorAdvanced circuit design to reduce interference LCD screen, readingCost-effectiveSimple operation, strong and durableColor: orangematerial: plasticProduct parametersResponse spectrum 280-400nmMeasurement interval 0-15.0Resolution 0.1Response time T0.5sMeasurement accuracy 10%-in supply DC3VOperating consumption 0.25WWeight (including battery) 125gProduct size 135x70x24 (mm)Screen size 2 inchesProbe material UV glass temperature 0-55Package Contents: 1 x - UVI UVI TesterOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.