The EA31 measures up to 20,000 foot-candles and 20,000 lux in four ranges with ±3 percent accuracy. This light meter features a compact and rugged design with a large display and analog bargraph to view trends. Additional features include Data Hold, Min/Max, Auto Power Off, and over-range indication. Comes with built-in stand, remote sensor with protective cover and 39-inch (1-meter) coiled cable, protective rubber holster, six AAA batteries, carrying case, and user manual. Model EA31-NIST is also available with a NIST traceable Certificate of Calibration.
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.
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
