You are correct on the size. My point was that the smaller dime , nickel and penny sized coins that make up the majority of coins found will not show as accurate at depth because of the larger size coin calibration.
I think most US machines are calibrated to smaller coin sizes than the Racers larger than quarter size target.
I have not used the Racer but have used the Fors Core which is calibrated the same and its depth reading was never even close and that was using all three coils. Showed dimes twice as deep as they actually were.
They really should calibrate their machines for the US using something smaller.
And yes it is only an estimate but it needs to be closer than it is.
Did not mean to upset you or anyone else I was just stating what my and others experience have been.
quote=TallTom]
Well, the Racer is calibrated for a coin that is not MUCH larger than our US quarter.
The manual says the Racer is calibrated to a coin that in one inch in diameter.
The U.S. quarter is just barely under one inch in diameter -- it's 0.955 inches in diameter,
or roughly 15/16 of an inch. That's pretty darn close to the Racer calibration size..
I find that the depth of U.S. coins turns out to be close to what the Racer indicates -- usually. That's especially
true when using the small five-inch coil.
But when you're digging a dime or a penny, that's a much smaller coin than a quarter. So if the Racer says it's
two inches deep, it's more likely to be about one inch. (Or anywhere from 0.5 to 1.5 inches, since
the Racer doesn't show fractions.) And it's just an estimate. Don't expect perfection in all conditions.[/quote]