Question on f75

We all have mineral soil. It's either organic or mineral matter or a combination mixed together. I suggest you download the manual and read the chapter on ground balancing. The F-75 has a very quict "FASTGRAB" feature to ground balance in seconds, or a slower but more precise manual process. It will alert you that you're in a problem area - at least it is having a problem. You can rebalance or just set a neutral default/reset in the worst-of-the-worst cases.

http://www.fisherlab.com/hobby/documents/Manuals_FISHER/F75Manual022807.pdf

From wet salt to magnetite it will run the whole range of minerals. It's a shame no one has responded from Montana. Is there a Fisher dealer you could call in the state?

The F-75 even gives you a ferrite bar graph so you can see hot spots (or large rusted objects).
 

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