70, I know what you mean about wanting to check the accuracy of that thing before using it on your engine, I probably go a little overboard when I assemble an engine and have my wrench checked first if it has been used for any thing else in the recent past. Don't forget to "warm up" that clicker by first cycling it at the desired setting a few times when you get ready to use it. As far as the beam type if used properly they are very accurate and I myself even prefer them to a clicker but then that is just me.
