Precision measuring instrument for delicate items - essential tool for jewelers Precision sliding gague measures up to 6" (150mm) in increments of 1/16" (1mm) Scale marked in Centimeter,Vernier Design will measure inside and outside of object Use for Permanent Makeup Tattoo Eyebrow Line Lip or science projects Length: 20.9 cm / 8.23" (Approx.),Width:7.2 cm / 2.83" (Approx.) Durable material: the mini sliding caliper is mainly made of plastic and the inner is inlaid with metal bar, which ensures it's not easy to break, durable enough for lasting a long time use Applicable occasions: good measurement tool for measuring diameter, can be applied to button, jewelry, round and small items, would not scratch the tested items, lightweight and easy to carry Convenient to use: double scale design allow you to get the measuring data accurately and clearly, you can use the 6 inch caliper to measure depth, width and length easily