300mm Vernier Caliper Calibration Block jo Block 12pcs

The block sets are designed for calibrate Digital Caliper 0-150mm, 200mm, 300mm, Each block as specified length. It is made of hardened steel. Inspector can join different size together to get different length. We call it wringing. Various grading standards include: JIS B 7506-1997 (Japan)/DIN 861-1980 (Germany), ASME (US), BS 4311: Part 1: 1993 (UK). Tolerances will vary within the same grade as the thickness of the material increases. For inspecting calipers, one should combine block and pin gauge to get more accurate inspection, Especial for length less than 10mm.  

Features: 

10,  20,  20, 41.2, 51.2, 81.5, 101.2, 121.5, 121.8, 191.8, 201.5, 291.8mm