Well, at the risk of a scolding from eightbore, the "Truth Tool" made by Johnathan Poole has been around for a dozen years at least and is the original horizontal tuning fork type wall thickness gauge and would appear to be much easier to use than the Manson. It was designed to be used in the horizontal position. Its upper fork is longer and can be hung in the end of the barrel when you are zeroing the gauge. The block has a hole in it that is large enough (1-1/2"?) to be hung from your thumb. It must be "hung" on the thumb so you don't torque the forks and throw off the reading.
It was $200 the last I knew.
I get repeatable measurements from it. On three different barrels I measured the minimum wall thickness with my Truth Tool and got within 1/1000th of Kirk Merrington's measurement. I measured them before I sent them to Kirk for some work.
Best,
Mike
Last edited by AmarilloMike; 09/12/12 10:34 AM.
