Pyle PLMT21 Handheld Lux Light Meter Photometer with 20000 Lux Range Per Second Sampling and Digital Display Measurement range up to 20,000 lux - sampling rate: 2 times/sec Reading hold function - 9V battery operated (not included) Adjustable range for quick easy readings Measurement range up to 20,000 LUX - Sampling rate: 2 times/sec Reading hold function - 9V battery operated (not included) Adjustable range for quick easy readings Accuracy Max 4% Repeatability: 2%