LS101 Solar Film Transmission Meter is able to simultaneously measure and display UV, IR rejection value and visible light transmission value. This meter is self-contained light sources and self-calibration. No manual adjustment is needed. The users only need plug the power supply, turn on the switch and put the solar film in the opening. The resulting performance data appear on the display. Specification Testing opening:20mm*70mm(W*H) UV Peak wavelength: 365nm IR Peak wavelength: 940nm VL Peak wavelength: 380-760nm, conforming to the CIE photopic vision function standard. Resolution: 0.1% Accuracy: ±2% (Colorless and transparent material) Size: 175mm*120mm*30mm(L*W*H) Weigh: 360g Power Supply: 4*AA alkaline battery(Not included) or 5V AC/DC power supply (USB Type-C interface)