... 1.Measures inside, outside, depth, etc. 2.reading error: 0.06 mm 3.Extra long design Stainless Steel 0-6 inch ... (0-150mm) Tube Lock Vernier CaliperWhen spring loaded thumb clamp is depressed the jaws move , Measures inside, outside, depth, and step ... for accurate workDescriptions:The Vernier caliper is an extremely precise measuring instrument; the reading error is 0.06 mm.Close the jaws lightly ...