| Range | Accuracy | Code No. | |
| .8-6" / 20-150mm |
± .001" |
309-06-4 |
|
| 1-8" / 25-200mm |
± .0015" |
309-08-4 |
|
| 1.2-12” / 30-300mm |
± .002" |
309-12-4 |
|
| Range | Accuracy | Code No. | |
| 20-150mm / .8-6" |
± 0.03mm |
309-06-4 |
|
| 25-200mm / 1-8" |
± 0.04mm |
309-08-4 |
|
| 30-300mm / 1.2-12" |
± 0.04mm |
309-12-4 |
|