I just looked at the Brownell's catalog. I have the gauge with 2 heads (10-12-16; 20-28). I see it's the same price to buy two complete gauges. I think I'd do that, then when going to a gun show, simply take the head off one (along with the ring to set it) and tote that along with the other complete gauge. Simple enough to swap heads and recalibrate, and by buying two gauges you have an extra rod and dial, just in case something happens to your other one. Would seem to me there ought to be a fairly decent discount if you buy just the gauge with two heads, but there isn't.
