The TC1800 Tint Meter – Tint-Chek Window Sensor - measures Visible Light Transmittance (VLT) of automotive glass and any glass/film combination up to 1/4" (6.5 mm) thick. Designed with no moving parts, the Tint-Chek eliminates the risk of damaging lever switches or scratching glass. This allows users to slide the glass into the opening from any direction. The TC1800 uses patent-pending techniques to remove ambient light interference caused by stray headlights or cloud cover — common issues that affect older VLT meters. It comes factory-calibrated to a NIST traceable standard, ensuring accurate results. The meter takes rapid, high-speed measurements and locks onto a single reliable reading without drifting. An automatic shut-off feature conserves battery life. Despite its compact 5" x 2.5" x 1" size, the TC1800 features a display that is 35% larger than competing models, making it significantly easier to read in the field. Included are two NIST calibration standards, a protective carrying case, and a 9-volt battery. The TC1800 is rugged, reliable, and built with USA-made, micro-processor controlled electronics — ideal for tint installers and law enforcement professionals.