1. Light weight, user friendly interface 2. Backlight function. 3. Voltage stability control technology, low power consumption 4. Measurement range: 0Lux ~200,000Lux 5. Power: 3 X 1.5V AAA battery (not included). 6. Application: Factories, schools, office, transportation route, house and so on, used to measure light intensity of various occasions.Specification: Package Weight One Package Weight 0.28kgs / 0.63lb One Package Size 23cm * 13cm * 5cm / 9.06inch * 5.12inch * 1.97inch Qty per Carton 60 Carton Weight 16.50kgs / 36.38lb Carton Size 48cm * 40cm * 50cm / 18.9inch * 15.75inch * 19.69inch Loading Container 20GP: 277 cartons * 60 pcs = 16620 pcs 40HQ: 644 cartons * 60 pcs = 38640 pcs