I find this thread a little amusing. Last year I asked the very same question: which is the wall thickness gauge that is considered the best?
Overwhelmingly the answers came back: The Hosford.
Someone supplied a link to vintagedoubles.com where Kirby was selling one, another supplied the Hosford phone number (but wasn't sure if it was for Jon or Tom Hosford), another the youtube links to the Hosford demonstration......
The Galazan was basically shat upon, but it might have been the season to crap on ALL things made and sold by Tony Galazan, whether it was RBL, A-10 American, Fox guns or a bore gauge or a wall thickness gauge. EVERYthing out of that Connecticut shop was dismissed out of hand.
This couldn't have been more than 6 months ago, although I do know how time flies. Maybe last summer(?)
So what has happened in the interim between then and now? Are these Manson, Galazan et al gauges brand spanking new?