Wandered over two old house yards.Found a few things, but less than expected.. Sensitivity set at 5 to 6......Later, decided to crank it up as far as the dial would turn at some other sites..got a few more goodies, doing better. Today, decided to air test a cent and clad quarter at a 6 setting, and full dial..The battery has about 25 hours on it, and still seems to be good..Cent at #6 setting gave 4 1/4 inches, at full dial ,it went to 5 1/2 inches..The quarter at #6 setting was 5 1/4 inches, and went to 6 5/8 inches with full turn..I am thinking that I dug a barber dime at 4 plus inches..my second yard out...Will try the air test again with a new battery....,Think I'll wander back over both yards to see if the extra" half inch" depth a 1266 X Fisher has ,will net me any more old coins...Are my numbers low,or ball park for the Silver UMax? I may be lucky that I haven't had the time to work over any more sites..Thanks , cordially NAD