This handheld Lux Meter measures 0-50,000 Lux in 3 ranges with Accuracy: ±5% + 2 digits. It features a separate light sensor, allowing you to take measurements at an optimum position. The sensor uses an exclusive photo diode and multicolor correction filter with a spectrum that meets C.I.E standard. The readout is precise and easy to see even when in bright ambient light. Compact and lightweight, it weighs only .36 lb with a battery installed. A carry case, instruction manual, and calibration certificate are included. Powered by one 9V battery (not included). This meter is ideal for photography, lighting industry, agriculture, scientific research, and teaching.