Digi-Met Aqua Universal Style Caliper. Coolant, Water and Oil Resistant! 4-Way Measurement; .0005"/.01mm Resolution. includes Certificate of Calibration Treaceable to N.IS.T. Made From Hardened Stainless Steel; High Precision Machined Frame. Features: Digi-Met Electronic Functions, 4-way Measurement - inside, Outside, Depth and step, Sliding internal Top cross Jaw, Length of bottom Jaws: 1.54" (40mm) , Resolution: .0005" (.01mm) , Accuracy: .001" (.02mm), Repeatability:1 Digit 10µm ±2s Model No. 18199,6" (150mm) Digi-Met Aqua Universal Style Caliper With Deluxe Wooden Case and NIST Certification