Basic Model: Measure the diameter of the Dial in inches, Also note if there is a screw or "bolt head" in the back. This determines if it can be adjusted or "resettable". Also note the mounting of the stem. the choices are: back, bottom and adjustable angle. You may also find some with left or right hand mounting, but these are less common. Select the Model from the following Table.
General Specifications
Model | Dial Size | Connection | Resettable |
20 | 2" | Back | No |
30 | 3" | Back | Yes |
31 | 3" | Bottom | Yes |
32 | 3" | Adjustable | Yes |
33 | 3" | Back | No |
34 | 3" | Bottom | No |
50 | 5" | Back | Yes |
51 | 5" | Bottom | Yes |
52 | 5" | Adjustable | Yes |
53 | 5" | Back | No |
54 | 5" | Bottom | No |