Originally Posted by
Digger_O'Dell
It only runs one frequency at a time, but the coils can run any of the 3 the machine uses instead of needing 3 separate coils. All you have to do is turn the power off and back on within a few seconds and it will toggle to the next frequency.
The 15 inch coil I've seen hit a quarter size target at around 24 inches using 3Khz. Probably be closer to 12 to 15 inches max at the 18.75Khz setting. Not shabby as even most PI machines won't do better with the same size coil until you get into the big dollar equipment.