Designed for the checking of micrometers and calipers. The standards are taken at 20°C


Gauge blocks (also known as gage blocks, Johansson gauges, slip gauges, or Jo blocks) are precision ground and lapped.
Grade I or (AA) suitable for Calibration
Tolerance +0.00010 mm to -0.00005 mm) used to calibrate inspection blocks, very high precision gauging, micrometers and other measuring instruments