Tint Check PRO 3800 Auto MeterExclusive two piece design allows for testing of the windshield, as well as rear and side windows. Takes high speed measurements shown on the real time display with no drifting of values. TC3800 uses patent pending techniques to remove any ambient light conditions that maybe changing the testing environment. Displays measurements to the nearest 0. 1% which will remove the rounding errors that can occur with the lower coast models.