General Classification
There are several variables in dial indicators:
- Analog versus digital/electronic readout (most are analog)
- Dial size. Typically referred to be American Gauge Design Specification (AGD):
| AGD | Diameter range (in) | Diameter range (mm) |
|---|---|---|
| 0 | 1 > 1-⅜ | 25 > 35 |
| 1 | 1-⅜ > 2 | 35 > 50 |
| 2 | 2 > 2-⅜ | 50 > 60 |
| 3 | 2-⅜ > 3 | 60 > 75 |
| 4 | 3 > 3-¾ | 76 > 95 |
- Accuracy
- Range of travel
- Number of dial revolutions
- Dial style: balanced (e.g., -15 to 0 to +15) or continuous (e.g., 0 to 30)
- Graduation style: positive numbers (clockwise) or negative numbers (counterclockwise)
- Revolution counters, which show the number of revolutions of the principal needle.
Read more about this topic: Indicator (distance Amplifying Instrument)
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