Feature: 1. LCD DISPLAY: The display window adopts a large color LCD screen, which is intuitive and clear, and is easy to read 2. THREE IN ONE OPTICAL PATH: Support measure light transmittance, blue light blocking rate and transmittance, UV blocking rate and transmittance, and UV400 in one hole alignment 3. FAST OPERATION: Support real time dynamic self calibration, realize instant fast measurement, and simple operation 4. FOUR DISPLAY INTERFACES CAN BE SWITCHED: Users can choose according to their needs to display transmittance, blue light, UV blocking rate and UV400; visible light, blue light, purple light transmittance and UV400; visible light, blue light transmittance and UV400; visible light, blue light, purple light transmittance 5. POWERFUL FUNCTION: Can be used for glasses lenses, mobile phone lenses, light transmittance of non blue light materials, no blue light, UV400 test Specification: Item Type: Vis Spectrophotometer Material: Stainless steel Measuring Beam Diameter: 1mm Measuring Material Diameter: ≥1mm Purple Light: Peak wavelength 395nm Blue Light: Peak wavelength 430nm Visible Light: 380-760nm full band, in line with CIE photopic function standard Resolution: 0.10% Measurement Accuracy: ±2% (colorless and uniform light transmitting material, 0-90% transmittance) Power Supply: DC 5V 1A. Package List: 1 x Vis Spectrophotometer1 x USB Cable1 x User Manual Note: 1. The instrument is self testing and self calibrating when it is turned on. No test objects can be placed in the test position, otherwise the self calibration cannot be completed.2. Avoid contact with corrosive items and keep away from high temperature and high humidity environment.3. When there is no test object, the transmittance data cannot be returned to 100% occasionally, and the instrument can be used normally after shutting down and restarting immediately without affecting the measurement accuracy.4. Please turn off the instrument when not in use.5. When the interface is abnormal voltage interface, please replace the power supply.