The Triplett TNM50 Tint Meter measures the transmittance of light for use on automotive windows, insulation paper, organic material, painting, coating material, film, glass, and plastic sheet. This unit can also measure the sun blocking capabilities of window curtains. Users are provided with a tool that has a 0 to 100% transmittance range with a 0 in. to 1/4 in. thickness range and an accuracy of ±2%. It also features a power-on self calibration. Readings are displayed on the 3-Digit, 999 count LCD. Automatic data hold locks the reading on the display for 30 seconds before auto-shutdown begins to conserve battery life. A continuous use function can be used to override auto-shutdown for longer operating times.