Durable: Mini sliding calipers are mainly made of plastic, with metal strips inlaid inside to that it is not easy to break, durable, and can be used for a long time Applicable occasions: a measuring tool with a good diameter, which can be applied to buttons, jewelry, round and small items, will not scratch the tested items, light and easy to carry Easy to use: The dual-scale design allows you to obtain measurement data accurately and clearly. You can easily measure depth, width and length with 5.9-inch (approximately 15.0 cm) calipers Size: The mini double size is approximately 21 cm long, with a measuring range of 0-5.9 inches (approximately 0.0-15.0 cm), which can your needs colour: black Material: plastic Package Contents: 10 x Mini double scale plastic calipers Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.