This 6" precision caliper features easy-to-read numbers, long wearing carbide faces and a hardened stainless steel body for a lifetime of service. Powered by two 3 volt batteries with automatic shut off. Resolution is .0005" (0.01mm), displayed in inches or millimeters.FeaturesProvides an IP65 level of protection against foreign matter, including water and coolant resistanceKnife Edge Measuring Contacts (both Inside and Outside)Thumb Operated Fine Adjustment RollOn/Off ButtonAutomatic OFF after 4 hours of non-useInstant Inch/Millimeter ConversionRS232 output port for data transmissionZero at Any PositionThree Volt Battery (CR2032) Included, approximately 3500 hour battery lifeFitted Plastic Case IncludedLinear accuracy of +/- .001" or +/- .03 mm, resolution is .0005"0-6" Range