Extech 407026 PC Interface with Heavy Duty Light Meter.

Heavy Duty Light Meter
Light Meter measures from 200 to 5000 foot-candles or 2000 to 50,000 Lux with 0.1FC/1Lux resolution. You can select from 4 lighting type settings for enhanced accuracy (Tungsten/Daylight, Fluorescent, Sodium, Mercury).

Additional Features
This heavy duty light meter also features Data Hold, Min/Max/Average, Auto Power off, and a percent reading of the differential from a reference point. Built-in RS-232 interface with optional Data Acquisition Software and Datalogger.

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