The device is a versatile luminance meter featuring a built-in sensor. It is capable of measuring luminance, flicker, correlated color temperature (CCT), and color rendering index () for displays, backlight modules, lighting fixtures, and other similar applications. In addition, it can present the distribution curve, allowing users to identify the characteristics and types of backlight sources with ease. Luminance Wavelength Range: 400nm ~ 700nm; Luminance Wavelength Interval: 10nm; Luminance Measurement Distance: 1m; Luminance Measurement Range: 1 ~1,000,000cd/m; Luminance Resolution: 0.01cd/m; Luminance Measurement Accuracy: (5%H+2cd/m) (H is the standard value, calibrated with the CIE standard illuminant A ); Luminance Unit Options: cd/m (default), fL; CCT Measurement Range: 1,000 ~ 100,000K CCT Measurement Accuracy: 5% (Calibrated with the CIE standard illuminant A) Measurement Range: 0 ~ 100 Measurement Accuracy: 2 (Calibrated with the CIE standard illuminant A) Flicker Frequency Measurement Range: 10 ~ 500 Hz Flicker Frequency Measurement Distance: 0.1m Flicker Frequency Measurement Accuracy: 5% Test Aperture Diameter: 10mm/20mm Host Size: 147.2mm x 72mm x 28mm Probe Size: Diameter 40mm x Thickness 76mm Display: 240 x 160 Dot Matrix LCD Operating Environment: Temperature 0 ~ 40, Humidity Less than 85%RH Measures displays, LED panels, lamps, and light sources. Swappable 10mm / 20mm probes for both large and small screens. Luminance range up to 1,000,000cd/m. Detects screen and lamp flicker to support eye safety. Identifies full-spectrum LEDs versus ordinary light sources. Human-eye-matched sensor for accurate color capture. Measures correlated color temperature (CCT) and color rendering index (). Provides real-time, maximum, minimum, and average brightness statistics. High-sensitivity digital probe ensures precise and reliable readings. Power supply: 2 x AA batteries (Not included batteries) Color: As Shown Material: plastic Package Contents: 1 set * screen brightness testers Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.