Have you ever tried to measure with a real caliper? Many of you dont even know what the caliper is. This app is not replacement for your digital caliper. If you are an CNC operator you should know that iPhone is a phone!
It works better than advertised and I would recomend it as a "must have" application.
For those idiots who attacked the developer: It is free app, you dont like it, delete it!
Miroslav1098 about Caliper