Standard Block For Hardness

Based on Japanese Industrial Standard

* The hardness standard is exceedingly accurate up to the world recognized values.

* The irregularity in hardness among individual pieces, or the range of error is extremely small.

* The uniformity in hardness is quite ideal

* Rockwell & Rockwell Superficial scale (HR), Vickers (HV), Micro-vickers (HMV), brinell (HB), etc.