The Lujan Window Tint Meter, No. VLT171, is a 2-pc meter capable of measuring all vehicle windows and displaying a visual light transmittance percentage. It features one button operation, four second testing, automatic shut-off and a 10-year LED light source. The corded sensors are attached to the meter, The VLT171 comes complete with a calibration sample and a durable hard case. The corded sensors are attached to the meter to avoid separation or loss.