Can somebody explain the Fisher F-series Fe3O4 meter to me?

[TrpnBils]

I've had the F5 since August and so far, this meter is basically just decoration. I know what it does, but what can you actually do with the information you get from it? Any special considerations for detecting based on how many bars it shows?

 

[elijahhenry10]

If I'm not mistaken, it should affect your ground balance.

 

[TrpnBils]

But regardless of the presence of that meter, you can still set ground balance with a separate set of controls.