People, make sure if you let someone use your test garden to check for depth that they are just to test and NOT FOR DIGGING UP THE COINS!!!!! I let this clown use my garden while I was busy doing something else and when I came out to see his results he had dug up my silver dimes that I had planted in 1974! Thank goodness he had stopped at the 6" dime, but still it gone now. I am so POed.