Hardness testers are calibrated (usually) onsite using the indirect verification method with standardized test blocks. A tester being serviced is given a general cleaning and any normal maintenance adjustments needed.
Accredited hardness parameters:
- Rockwell scales A, B, and C
- Rockwell superficial 15N, 15T, 30N, 30T, 45N, 45T
- Vickers & Knoop
- Durometers in accordance with ASTM D2240