Anyone use the Prizm II?

The prizms should work fine in the dry sand. If the GB is off there is an adjustment pot you can turn through an access hole in the lower front corner. You'll see a small rubber plug. There is one on each side. The other is for the true all metal threshold. I don't know which one is which but call Whites and they will help you if needed. Or if you've messed with GB or threshold on other units it will become apparent by turning the pots. If your not sure how to adjust the GB then you may want to leave it be.
 

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