◆ ultra-hardness， induction hardening， the overall refining process.
◆ 4 measurement functions， OD， ID， depth and height.
◆ made of stainless steel， matt chrome surface engraved lines.
◆ ruler engraved lines matt chrome plated surface， using advanced laser scribing process， clear-lined， wear.
◆ ergonomic design， beautiful and comfortable and durable.
◆ its full performance so you can easily solve the problem.