Digital calipers can be used to measure inner diameter, outer diameter, depth, step, etc. There will be no short circuit or internal contact with the positive and negative poles during measurement, which is than metal calipers. A perfect and accurate caliper measuring tool for home/jewelry/DIY measurement Please note: This caliper is not intended for professionals who require high . The switching function between the two units can meet different needs, making it more convenient to measure the value you want and has a range of applications. [LCD Display and Automatic Shutoff]: High-quality and digital caliper, LCD display reading is more convenient, quickly and easily get accurate results Colour:Black+Silver Material:plastic Package Contents: 2 x Plastic digital caliper (black + silver) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.