SPI Extra Smooth Movement Dial Caliper Features Include.. Measuring Range: 0-12" Graduations: 0.001" Range/rev. 0.100" Jaw Length: 2.51" Accuracy: + 0.001" Dial Color: Black Dual pinion mechanism offers extra smooth feel Sturdy aluminum die-cast housing 4-way measurement: inside, outside, depth and step Shock proof design Certificate of Calibration included Furnished in fitted case