Multiple parts, like those in figure 3, can be placed on the stage and measured either manually or automatically. Steel, it is safe to carry in tool boxes and has a pocket clip to make it extra handy.
A program can be created for this purpose.
How to measure rubber o rings. O rings are measured in millimetres (mm). These values can be used together to find the circumference. Using a ruler, measure the distance between the outer edges, which will give you the outside diameter (od) using the ruler again, measure the distance across the inside of the ring, which will give you the inside diameter (id)
Determine the inside diameter by using a ruler to measure from one inner edge to another. One part is chosen as the reference, and the desired measurements are programmed into the command window. Please see below image to help you locate where to take measurements from.
If you don’t have one available, various other sizing tools. Use a ruler to measure from one inner edge to another. This will help determine how large of an opening your seal should have.
Use a ruler or calipers to measure from one inner edge to another. A good fit is critical when planning to replace an o ring. Determine the inside diameter by using a ruler to measure from one inner edge to another.