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 50,000 lux +/- 5% * Product comes equipped with a light sensor that is separate from the reading device, allowing its users to take measurements at an optimal position. * Package Contents: 1 x Digital Light Meter * HDE® is a registered trademark and is the only authorized seller of HDE branded products