This Extech Model 401025 Light Meter is in excellent like new condition, fully tested, and is guaranteed to function 100%. This item came from a local lab that was upgrading equipment and had surplus lightly used inventory. Please feel free to contact us with any questions. Foot-Candle/Lux Meter Using a precision photo diode and color correction filter, this meter accurately measures light intensity from 0 to 5,000 Fc (foot-candles) or 0 to 50,000 Lux with a resolution of 0.1 Fc/1 Lux. Additional Features This Extech light meter features fast/slow response time, automatic zero adjustment, 2000-count LCD display, overrange indicator, and an analog output (1 mV per count) for capturing readings to a recorder. What is a light meter? A light meter measures the amount of visible light, also known as illumination, in a given area. For many meter brands, including Extech, illumination is expressed in units of measure called Lux (for metric) and Foot candles (used in the US). To use an Extech light meter, the sensor is placed on a tabletop or other surface in the area to be measured and the light level reading is indicated on the meter's display. Various types of lighting There are many different types of lighting that can be measured. The most common are: Sodium, Tungsten, Mercury, and Fluorescent. The following list shows common applications for each lighting type.Sodium lighting: Highway, parking lots, security measurements Tungsten lighting: Sunlight and incandescent lighting measurements Mercury lighting: Highways, parking lots, stadiums Fluorescent lighting: Indoor lighting for workstations and store display areas FOR ADDITIONAL INFORMATION PLEASE VISIT SITE BELOW: extech.com/instruments/resources/manuals/401025_UM.pdf Track Page Views With Auctiva's FREE Counter