THE ENNOLOGIC LIGHT METER measures illuminance, the amount of light incident on a surface per unit area. Illuminance is measured in lux or foot candle, and the displays both. It is a great tool for measuring light levels in offices, labs, warehouses, classrooms, and homes. Useful for checking desk and work surface lighting, and to compare light levels in different environments. Indispensable when establishing safe or minimum levels of illumination in a work or living environment | WORKING ON THE LIGHTING IN YOUR HOME? It can be very difficult to objectively assess light levels with the naked eye - use this meter to get an accurate reading of the actual light levels every time. Compare different lamp types and wattages. Check the light level when installing accent lighting. Or maybe you're replacing incandescent light bulbs with LED light bulbs? Use the ennoLogic lux meter to compare brightness before and after | Windows Compatibilty: Windows 10, 8, 7, Vista &XP (Do not run in Mac OS) | MANY OTHER USES: Find out how many lux of light the light box you use for bright light therapy puts out. Or maybe you need it for a science fair project. IMPORTANT NOTE: The ennoLogic lightmeter is NOT for photography. This device does NOT allow you determine the proper exposure for a photo. Its purpose is to show you light INTENSITY in lux or foot candles at any given spot | RELIABLE AND ROBUST LIGHT METER: Measurement range 0-200,000 lux. Lux and Foot-Candle units. MAX, MIN, and AVERAGE reading display and ANALOG BAR GRAPH DISPLAY. HOLD function. Analog outputs (DC and AC). Large 1.5"" LCD display with BACKLIGHT, easy to read even from a distance. Tripod mount (tripod not included). External power option. Auto power off with override option. Comes with carrying case, 4x AA batteries, analog output interface cable and user manual