Baker Tyre Tred Depth Gauges has Following Features:The gauge gives accurate readings to 0.1mm.A 'telltale' maximum reading pointer is fitted to retain measurement, allowing the gauge to be applied to the tyre positions where it cannot be easily read.A test piece can be supplied to check the accuracy at 1.6 mm. This is an optional accessory and should be ordered separately.The dial has coloured bands for quick and easy reading.Baker Tyre Tred Depth Gauge, Model no. TTG02, Range: 0.32inch, Resolution:0.005inch, Dial Reading: 0-0.32, Units/Pkg: 1, Warranty: As per manufacturer's warranty policy.