tried a test today with my 250. after digging nothing but trash. except two Penny's (i think buy accident mixed with other trash) i buried a new penny 6" tried sen. from 3 to 8 on coin, relics, jewelry. could not get a reading on it. reburied it at 4" and did same test. could not read it. it will read on surfice. tried the same test with a dime. i did get a reading at the 4" mark.which read constantly as a nickel, instead of dime.it did read as a dime when exposed. my question is does a coin need to be buried for along period of time to send off a return signal? with my sen. set at 4 I'm getting return signals at give or take 8" any input would be appreciated. thank you. lee
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