On a handful of occasions i have seen either the tone say dig and the meter say no or vise verse.
Last winter i hit a target and the tone was choppy but the meter was good,
A hunting bud with a tone only machine said no dig, i tried but it was frozen in.
A week later went back with small coil , same thing , i pried the dirt/ice and pulled a Indian Head.
The F 75 TID and tone run independent of each other , Usually thy mach up but not always.
Last winter i hit a target and the tone was choppy but the meter was good,
A hunting bud with a tone only machine said no dig, i tried but it was frozen in.
A week later went back with small coil , same thing , i pried the dirt/ice and pulled a Indian Head.
The F 75 TID and tone run independent of each other , Usually thy mach up but not always.