Features: 4000 LCD display counts Auto Ranging 41 Analog bargraph/segments High accuracy and rapid response Low power consumption Peak hold Relative mode Max and data hold Auto power off Low battery indication User selectable FC/Lux USB interface Specifications: Model: DT-1309 Resolution: 0.1Lux/ Fc Accuracy: +/- 5%+/- 10d(©"10,000Lux), +/- 10%+/- 10d(>10,000Lux) Measuring Rate: 1.5 times/second Measuring Range: 0.1Lux to 50,000Lux Power Source: Alkaline battery(Not included) Voltage: 9V Photo Detector Dimensions: 115 * 60 * 27mm Meter Dimensions: 165 * 76 * 43mm(H*W*D) Package includes: 1 * DT-1309 Luxmeter 1 * Photo Detector 1 * User Manual