I own a 250. I have found several wheats and silver coins with it. I do this to pinpoint with it: Get a good, repeatable "bong" with it. Slowly and carefully, swing the coil side to side... moving it away and towards you to put the taget "halfway up the coil". Step 90 degrees to the target.... that is to say... ACTUALLY step around the target 90 degrees. Then move the coil side to side again while moving it away and back to you, centering the coin. DO NOT push the coil away from you instead of doing the step! If you DO THE STEP, you will shortly be able to pinpoint with it well enough to push a screwdriver into the ground and HIT the coin. If the repeatable signal is nolonger "bonging" after doing the step, and the display is popping up and down the display, don't bother digging. Hope I've been helpful. TTC