The master gauge used in measurement comparison is not only heat treated, but also sub-zero treated to make exceptionally precise and high quality parts. These are used to calibrate the probe sensors maximum and minimum points of the range. The ring style masters are used to calibrate ID type through hole sensor probes.
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| Size D | d | B |
| 2 to 2.5 mm | 22 | 6 |
| 2.5 to 5 mm | 22 | 10 |
| 5 to 10 mm | 32 | 12 |
| 10 to 15 mm | 38 | 14 |
| 15 to 20 mm | 45 | 16 |
| 20 to 25 mm | 53 | 18 |
| 25 to 32 mm | 63 | 24 |
| 32 to 40 mm | 71 | 24 |
| 40 to 50 mm | 85 | 32 |
| 50 to 60 mm | 100 | 32 |
| 60 to 70 mm | 112 | 35 |
| 70 to 80 mm | 125 | 35 |
| 80 to 90 mm | 140 | 35 |
| 90 to 100 mm | 160 | 35 |
Material: SKS3
Hardness: HRC58 ~ 63
Sub-Zero treatment
