The newer, smaller Inspector II was made for measuring the tint on windows that do not roll down. The Inspector II Tint Meter has a two-piece design that allows you to wedge the glass in between you are testing.It can measure material as thin as a sheet of window film up to half an inch thick glass. A magnet alignment mechanism and auto-calibration promote consistently accurate readings. For hard to reach areas, a suction cup adheres the light source to the inside of the window. The Inspector II is not affected by ambient light and performs as accurately in the day as it does at night.Each meter is equipped with two (2) N.I.S.T. traceable reference samples to verify its accuracy.