There are several variables in dial indicators:
* Analog versus digital/electronic readout (most are analog)
* Dial size. Typically referred to be American Gage Design Specification (AGD):
AGD Diameter range (in) Diameter range (mm)
- 0 1–1 3/8 25–35
- 1 1 3/8–2 35–50
- 2 2–2 3/8 50–60
- 3 2 3/8–3 60–75
- 4 3–3 3/4 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.
Dial Indicator
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