This Faithfull Tread Depth Gauge is easy to use and quickly checks whether tyres are legal and roadworthy plus it helps to spot uneven thread wear and tracking errors. It gives fast and easy-to-read measurement of tyre tread depth from 1 to 24mm in one millimetre graduations on sliding barrel. It has a steel body with easy-to-read sliding plastic centre column. It includes a 1.6mm graduation marking to comply with MOT minimum tyre-tread depth requirement. Supplied with full instructions.