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The NEL coils always list, for the Whites, to work with all Prizm Series and Coinmaster, Coinmaster Pro, but excludes the GT. Turns out that when NEL designed these coils, they tuned them for the machines available at the time. The GT was not out yet when this was designed. It works with the Prizm 6T, so why not the GT? It overloads at full sensitivity, but is fine from 9 down. Target ID is still accurate, as is the depth. This is a great coil. TexasTigerDigs has a really nice video on the NEL Tornado coil on his Coinmaster GT. Check it out if you get a chance. I purchased this coil from Phil at Myers Metal Detectors in Tampa. www.myersdepot.com