Metric Scale. 0 to 25mm range with metric micrometer calipers. Friction stop causes adjustment knob to slip at the same pressure each time, ensuring reproducibility. Reads to 0.01mm.
English Scale. Useful over 0 to 1 in. (0 to 25mm) range, readable to 0.001 in. (0.025mm). Otherwise similar to metric-scale version.