Review on Fowler 52 646 100: Optimal Measuring Graduation Interval for Precise Accuracy by Brian Cooper

Was did not come in the original packaging.looks like it was opened up at some point and thrown away as it didn't have a few extensions.time was a big factor so i had no option to return it,i just had to use it as is, Other than that, dial indicators are a joke for tight tolerance measurements, I understand most engine manufacturers use them, but the reason they use them is because they're modular...not because they are are the right tool for the job, and that it's cheaper to just buy 1 gauge Go to a real mechanical shop (like one that's not based only on automobiles) and see what gauges they use. They won't see a dial gauge unless they have a deep hole that they can't reach with their cholematic or comptor gauge. If you buy this you will need a tuning tool if you want your measurements to be at least an approximation. Can it be configured with a microphone? Yes, but it will be about as accurate as you can throw a stone. There isn't enough surface area on the mic pads to set this up consistently and get reproducible measurements. Some will argue that I'm sure they've been using them for years and can fit them on a nut... but my 20 years of body shop experience tells me that's not enough. When using this caliper on engine gaps, ALWAYS confirm your measurements with plastige. You'll probably be shocked at how far the interior display can go.