The digital light meter will allow you to measure the lighting in an area | The digital light meter uses a 9V battery(not included); Accurate up to 200,000Lux +/- 5% | Resolution: 0.1Lux / 0.01Fc, Accuracy:±4%,Measurement speed: 2 times / second,Units: Lux & Fc | Hold function, Auto range & Manual range,Auto Power OFF: After approx.15 minutes | Low power of battery detecting,Operating Environment: 14 to 122℉(-10 to 50℃), 10%~90%RH