Lots of folks buying lots of electronics that are essentially random number generators and then spending their time trying to figure out why they make little sense. Unless you figure out how to calibrate/verify what these "instruments" (being generous in many cases) are indicating, there's no reason to assume they're offering useful data. They may be consistent within themselves (i.e. they have precision) and may be useful under that umbrella(only), but without verified accuracy they have little connection to reality..or other devices. Toss in the software that lays on top of all theses devices..yikes. (imho..as a retired chemist that is familiar with real instrumentation as well as gage R&R instrument capability analysis)