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Once you find the critical point, the detection will be easier.
The measurement range is about 8cm in the air for a 1 dollar coin.
You don't need to worry all the deep holes in your backyard., it's not for serious metal detecting.
Bury the coins or metal targets on the beach shallowly, easily search them just for fun. Your kids will feel full sense of accomplishment.
This is best for kids from 5-10 yrs old.
Please remember, the detecting range depends on the size of metal, the metal purity, solid quality and the operation of machine.
