This type of gauge heads are used to measure inside diameter of holes.
Air is directly released through nozzle hole into the measured product and this type provides non-contact measurement.
IA TYPE:
| Nominal Size ød exceeded ~ less | L1 | L2 | L3 | L4 | |
| 4 exceeded 8 or less |  |
8 | 20 | 30 | 90 |
| 8 exceeded 11.5 or less |  |
8 | 20 | 30 | 90 |
| 11.5 exceeded 14 or less |  |
15 | 45 | 5 | 85 |
| 14 exceeded 24 or less |  |
20 | 45 | 5 | 85 |
| 24 exceeded 40 or less |  |
20 | 45 | 5 | 85 |
| 40 exceeded 50 or less |  |
20 | 50 | 10 | 100 |
| 50 exceeded 65 or less |  |
20 | 50 | 10 | 100 |
| 65 exceeded 100 or less | 20 | 50 | 10 | 100 |
IB TYPE:
| Nominal Size ød exceeded ~ less | L1 | L2 | L3 | L4 | |
| 4 exceeded 8 or less |  |
3 | 20 | 30 | 90 |
| 8 exceeded 11.5 or less |  |
4 | 20 | 30 | 90 |
| 11.5 exceeded 14 or less |  |
4 | 45 | 5 | 85 |
| 14 exceeded 24 or less |  |
4 | 45 | 5 | 85 |
| 24 exceeded 40 or less |  |
4 | 45 | 5 | 85 |
| 40 exceeded 50 or less |  |
4 | 50 | 10 | 100 |
| 50 exceeded 65 or less |  |
4 | 50 | 10 | 100 |
| 65 exceeded 100 or less | 4 | 50 | 10 | 100 |
IC TYPE:
| Nominal Size ød exceeded ~ less | L1 | L2 | L3 | L4 | |
| 4 exceeded 8 or less |  |
2 | 20 | 30 | 90 |
| 8 exceeded 11.5 or less |  |
2 | 20 | 30 | 90 |
| 11.5 exceeded 14 or less |  |
2 | 25 | 5 | 85 |
| 14 exceeded 24 or less |  |
2 | 25 | 5 | 85 |
| 24 exceeded 40 or less |  |
2 | 25 | 5 | 85 |
| 40 exceeded 50 or less |  |
2 | 25 | 10 | 100 |
| 50 exceeded 65 or less |  |
2 | 25 | 10 | 100 |
| 65 exceeded 100 or less | 2 | 25 | 10 | 100 |
