Specifications: Item Type: UVA Meter Material: Gel, ABS Irradiance : 0- μW/cm2 UVA Response: λp=320-400 nm Resolution: μW/cm2 Conversion Rate: 3.0 Readings / Sec Display: 3.5-bit LCD Size: 0.4 Inches High Operating Temperature: 32℉ to 90℉ Operating Humidity: 5% to 80% Accuracy: +10% REF Traceable Source Product Size: Approx. 165 x 75 x 30mm / 6.5 x 3 x .2in Power Supply: 2x1 5V AA Battery (Shipped Without Battery) Lens: Glass Weight: Approx. 231g / 0.5oz Voltage Parameter How to Use Just press the on the front of the device. Point the sensor window on the top panel of the meter directly at the source. Read the notes on the LCD screen and make notes as needed. To get more accurate data, run multiple tests at the same distance and average. Battery operating voltage is 3V to 2.5V. Below 2.5V the LCD number will begin to darken, indicating the need for battery replacement. Package List x UVA Meter x User Manual