This Portable Digital Lux Meter with PC Interface 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 21000 Reading Internal Memory (Data record function) Data logging Function Lux and Fc switchable Data hold function High Accuracy Min/Max/Avg function PC Interface Detachable sensor Time and date display Low power consumption Auto OFF function (disable during recording) Hi/Low Alarm setting Adjustable Over / Under alert threshold via computer interface Bar graph display Low Battery Alert Tripod Mount thread (Tripod not included) 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% ±5% rdg (above 10,000 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 Record Interval: 1~60 sec / 1~60 min / 1~24 hrs Windows Compatibilty: Windows 10, 8, 7, Vista and XP (Do not run in Mac OS) Operating Environment Temperature: 0 ~ 50 °C (32 ~ 122 °F) Humidity:10 ~ 90%RH Storage Environment Temperature: -10 ~ 60 °C(14 to 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 cable 1 x AC/DC Cable 1 x CD Software 4 x AA Size Battery Carrying Case