IP54 Digital Caliper with Exclusive Feature: Fastener Size Reading. Range: 0-12″ / 0-300mm. Resolution: 0.0005″ / 0.01mm / inch 128th. Accuracy: 0.001″. Dust, water, and oil resistant to IP54 standards. NEW! A function that gives you true reading on all standard size fasteners, bolts, and nuts. No more guessing or complicated conversions needed. Fastener Reading: 32nd, (1/2, 4th, 8th, 16th). 4 Reading Modes: Inch, Metric, Inch Fractional, & Fastener Size. Large LCD digital display. Auto Power Off. Battery: 3V CR2032. Complete with fitted case.