Do waterfowl calipers have security codes? Where are they?

Waterbird calipers have security codes, which are on the handle of the waterbird calipers. Because the anti-counterfeiting code designed on the handle of the waterbird caliper is easy to identify, the product quality is guaranteed. Waterbird caliper is a tool for measuring length, which can be divided into random caliper and random caliper. The methods of use include steel rule to length method and caliper measurement method.