Product Design FeaturesStrictly conforms to the CIE 1931 color matching function standardEYE2-400：Luminance accuracy: ±2%, repeatability: 0.8%.Colorimetric accuracy: ±0.003, repeatability: 0.002 (above 0.01cd/㎡ at low brightness)Luminance accuracy: ±1.5%, repeatability: 0.2%.Colorimetric accuracy: ±0.002, repeatability: 0.0008 (conventional 0.1 cd/㎡ and above), highly spectrally matched to CIE 1931 color matching functions.New USB lock clip mounting designTighten the screws during use to securely lock the data cable to the product.2- Can prevent disconnection or damage caused by mechanical movement or external forces.3- Save customers' time and maintenance costs.