Irecently lent my prism out and had it returned to me today,so i decided tostop at a park in a local area.The prism was hitting coims at 5-6 inches ,it had been so long since i have used it i was really impressed. 2 hours andi had 1.78 cents and a master lock key.I have been told years ago that it's a very good ring finder too.I did find a ring with another prism ii when i first started detecting HH