Measures in inch or mm from 0 to 6 inches at 0.0005" resolution, with 0.0015" accuracy IP54 level protection against dust and water. Hardened stainless steel construction with stainless steel jaws: 1.56 inch jaw length x 0.136" jaw thickness. Easy-to-read 1/2-inch LC display and an automatic off to maximize battery life Useful inch/metric and fraction/decimal conversion 4-way measurements: inside, outside, depth, and step For over 60 years, SPI has introduced innovative products to the metalworking and laboratory industries. SPI measuring instruments are durable, precise, and reliable — all backed by an Industry leading 2-Year warranty. The 18-010-9 electronic digital caliper measures in inch or mm from 0 to 6 inches at 0.0005" resolution, with 0.0015" accuracy. IP54 level protection against dust and water. Features an easy-to-read 1/2-inch LC display and an automatic off to maximize battery life. Useful inch/metric and fraction/decimal conversion. 4-way measurements: inside, outside, depth, and step. Hardened stainless steel construction with stainless steel jaws: 1.56 inch jaw length x 0.136" jaw thickness.