The newer, smaller Inspector II replaces the Inspector I and TM400 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 sandwich the glass you are testing, which is ideal for inspection stations. It can measure material as thin as a sheet of window film up to half an inch thick glass. A magnet alignment mechanism and autocalibration promote consistently accurate readings. For hard to reach areas, suction cups adhere the light source to the inside of the window. Just like the Inspector I and TM400, 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.