I purchased this digital caliper to measure both the filament going into my 3D printer, as well as to create precise measurements for the designed objects I was looking to print. This has been a fantastic tool to help me accurately plug in the average diameter of my filament and has yielded superior prints ever since. There is one small con though on this product. When I am using this one handed, I tend to pull back the caliper using my thumb and forefinger and often times when my thumb is on top of the caliper as opposed to the side, it slides the battery cover off. This is a very minor thing, but it happens quite frequently, enough that I might have to put a small piece of tape to keep it in place. Other than this one small issue, the caliper has been performing superbly.