1. This meter is used to measure the brightness of fluorescent screens and transmission screen, which has wide applications in the TV sets, medical X-rays and more.2. Powered by a silicone photocell, the light detector is of high photo stability and good shock resistance, which can achieve accurate photometric measurement.3. With a wide measuring range of 0.01-39990 cd/m2 and 4 optional measuring range.4. Low Power Consumption: It can work constantly for about 100 hours on a 9V battery (not included).5. Compact and portable, easy to use. Packing list: 1 * Screen Luminance Meter1 * Black Bag Note:1. Due to the difference between monitors and light effect, the pictures may not reflect the actual color of the item.2. Please allow slight error due to manual measurement. Thanks for your understanding. Specification: Measuring Distance: ≤1m Accuracy: ±0.5%+1 Spectrum Response Characteristics: Linearity Error: ±0.2%+1 Temperature Characteristics: ±0.1%+1 Working Environment: 0~40℃, ≤85%RH Power Supply: 1 x 9V 6F22 battery (Not included) Color: Shown as pictures Size (Approx.): 16*8*4cm / 6.30*3.15*1.57in Weight: Approx. 868g / 30.6oz Measuring Range: 0.01-39990 cd/m2