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Once you find the critical point, the detection will be easier.
The measurement range is about 6cm in the air for a 1 dollar coin.
You may think that's not a very ideal depth.
You don't need to worry all the deep holes in your backyard.
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, soid quality and the operation of machine.
