Feature: Durable to use: Vernier caliper is mainly made of plastic and the inner is inlaid with metal bar, which ensures it's not easy to , durable and practical. With proper size and lightweight design, you can carry, use and the plastic vernier caliper . Practical design: Double scale on the vernier caliper is clear and easy to read, allows you to the measuring data accurately. It can be applied to button, pearl, jewelry, rings, bottles, cans and small items, would not scratch the tested items. Size: as the shows What you will : contains 20 pieces of mini plastic vernier calipers in the package, enough to meet your use and replacement needs, you can share with you family member, , classmates, . Size detail: the mini double scale plastic vernier caliper's size is . 21 cm in length, measurement range is 0-6 inch/ 0-150 mm, can meet your needs ; With proper size design, you can carry, use and it Convenient to use: the double scale on the vernier caliper is clear and easy to read, allows you to the measuring data accurately and clearly, you can use the 6 inch/ 150 mm caliper in increments of 1/16 inch/ 1 mm Color: black Material: plastic Package Contents: 20 x Caliper 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.