Digital These three digital depth gauges give measurements in imperial or metric with resolution to 0.0005in. or 0.01mm. It has functions for ± deviation from nominal, instant metric/imperial conversions and an output port for transmission to Mitutoyo SPC data processors. The non-contact linear measuring system is unaffected by electrical interference or magnetism and will compensate for mechanical wear. All gauges are supplied fitted with an SR44 battery (stock no. 593-423).