Characters for ceramic pin gauge:
good wear resistance, long working life.Working life is many times than metal pin gauges.
Good anti-corrosion performance and never rusty, so you can use them by your hand directly, needn't any special protect treatment.
CTE ( coefficient of thermal expansion ) smaller than steel, can be directly used for steel parts inspection.
White surface, laser lettering is easy to read.
Quality character: roughness ≤ Ra0.20mm density ≥6.0g/cm3 , hardness[...]