Products comply with GB/T14899 standards. Smooth flipping a clear scale on the surface of plating. With locking pliers can compare absolute measurement and measurement. Friction ratchet locking devices or casing to ensure accurate repeat precision. With a benchmark bar (not including 0-25). All measuring surface hardening grinding the dial is clear convenient for reading. Simple structure convenient use and maintenance high sensitivity stable and reliable accuracy. Probe for high abrasion resistant alloy steel manufacturing shell after chrome plating processing achieved the effect of anti-rust durable and beautiful. Seismic exquisite packaging.