This LED Light Meter is capable of measuring popular light sources including white, red, green, yellow and blue LEDs up to 199,900 Lux (19,990 Fc). The R8140 includes an auto-ranging feature to optimize resolution and keeps track of minimum and maximum readings. This instrument is also capable of measuring standard incandescent light sources. Measures ambient light levels of white, red, yellow, green and blue LED light and visible light in Foot-candles or Lux. Large, backlit LCD display. Detachable and rotatable light sensor. Min/Max and data hold functions. Cosine and color corrected measurements. User adjustable parameter for specialized light sources. Low battery indicator and auto shut off. Light range of 0 to 199,900 LUX (0 to 19,990 ft-cd). Accuracy of Incandescent Light Source is (3% rdg. + 5 dgt) (Otheer Visible Light Source: 8% rdg. Resolution of 0. 1 Lux (0. 01 ft-cd). Response Time of 500mS. Silicon photodiode sensor with color correction filter and cosine correction. Light Types: White LED, Yellow LED, Green LED, Red LED, Blue LED, Warm White Fluorescent, Cold White Fluorescent Lamp, Incandescent. Automatic and Manual Autoranging. 6-Digit LCD Display. Min/Max and Data Hold function. Overrange Indicator. Auto Shut-off after 30 minutes. Powered by 2x AA Batteries. 6. 7''H x 2. 5''W x 1. 5"D. Weighs 7. 4 oz (210g). Includes the Detachable Sensor, Sensor Cover, Hard Carrying Case and 2x AA Batteries. Auto-ranging LED light meter with detachable and rotatable sensor that allows for one-handed operation.