It is used for checking the level of luminance, the measure of the amount of light falling on a given surface. It applied in the fields of cinematography and scenic design, in order to determine the optimum light level for a scene, where they can help to reduce the amount of waste light used in the home, light pollution outdoors, and plant growth to ensure proper light levels. Features: Auto-ranging Large Display with backlight Lux and Fc switchable Data hold function Min/Max/Avg function Detachable sensor Time and date display Bar graph display Low power indicator Auto OFF function Hi/Low Alarm setting Tripod Mount thread (Tripod not included) With USB cable for power supply CE Certified & RoHS Compliant Specifications: Standard Applied: CIE standard & CNS 5119-1988 Measure Range: 0 ~ 200,000 Lux ( 0.1 ~ 18,581 Fc) switchable Accuracy: ±4%(0~10,000 Lux); ±10% (above 10000 Lux) Resolution: 1 Lux/0.1Fc Sampling Time: 0.5 Second Analogy Bar Graph: 0~2000 (x 10 or x 100) AC signal output: 4Vrms / full barograph, output impedance is approx. 600 ohm DC signal output: 33mV/dB Operating Environment Temperature: 0 ~ 50 °C(32 ~ 122 °F) Humidity:10 ~ 90%RH Storage Environment Temperature: -10 ~ 60 °C(14 ~ 140 °F) Humidity:10 ~ 75%RH Power Supply: 4 x AA Size 1.5V Battery or USB Power Cable Item Weight: 290 gms (battery included) Product Dimensions: 24 x 6.5 x 3.5 cm (with 1 meter extended detachable sensor) Set Includes: 1 x Digital Lux Meter 1 x Light Sensor 1 x English User Manual 1 x USB Power cable 1 x AC/DC Cable 4 x AA Size Battery Carrying case