Extech 401025-NIST Foot Candle/Lux Meter with NIST

401025-NIST is a Foot Candle/Lux Meter which measures light level to 5000FC (foot-candles) and 50,000 Lux with a 5% accuracy using a precision photo diode and color correction filter. Meter features fast/slow response time and an analog output (1mV per count) for capturing readings to a recorder. Comes complete with 9-Volt battery.

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