Professional Digital Light Meter for Hydroponics Greenhouse LX803 Professional light meter LX803 for use in greenhouse and hydroponics Measures in Lux and has four Measurement Ranges: 0 to 200 / 2,000 / 20,000 / 200,000 Lux Resolution: 0.1 Lux Accuracy: +/- 4.0% , repeatability +/- 2% Data hold saves the current test result, low battery indicator Battery: 1x 9V (included!); Battery life approx. 150 hours