Equipped with photoelectric sensing technology which can effectively represent light intensity with electrical signals then processes data and displays the result on LCD. It is light weight compact ergonomic and user friendly making it a great tool for monitoring light intensity in schools and laboratories. Requires 3 x AAA 1.5V batteries (available separately).Can withstand the impact of landing from 1 meter height4 digits LCD displayAdvanced photosensitive sensing technology design that the product is more sensitiveReal-time detection of environmental illuminanceIllumination 0-9999 Lux/=10000 Lux 1 Lux/10 Lux ±(4%rdg+8dgts)/±(5%rdg +10dgts) (regulate in the standard of 2856K colour temperature flat lamp) Note: 1FC=10.76 LuxRange 0-199999 Lux Auto-rangingSampling Time 0.5s Refresh sampling in 0.5sOverload indication OL Shows ""OL""MAX/MIN Measurement HOLD Shows ""HOLD""Backlight BL Manually on and offAuto Power Off 5mins Automatically power off after 5mins without operationLow Battery 3.0 - 3.5V Shows low battery prompt when power is 3.0 - 3.5VSpecification:Size: 160 x 50 x 28mm.Weight: 118gAccuracy: 0- 9999Lux ±(4%rdg+ 8dgts) 10 000Lux ±(5%rdg+8dgts).Battery requirement: 1.5V batteries (AAA) x3