iKKEGOL Precision 100mm 4 Inch Digital Electronic Gauge Stainless Steel Vernier Caliper Micrometer (Small) Easy to operate, one button to switch between inches to mm Measuring range: 0-100 mm/ 0-4 inch. Accuracy:  0.02 mm/ 0.001 in Hardened stainless steel shaft with depth-measurement probe, precision ground jaws Measures inside & outside height dimensions, with a large LCD display, easy to take readings Requires one LR44 battery was included,comes with 1-year warranty