Agroshield
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None I’m afraid. I’ve searched and searched. Hoped someone here would know.
Found an identical one. I guessed at the logarithmic scale based on it starting at one. Log scales do not go down to zero. Whatever the scale, it sure isn't linear. Seller's description might be plausible but not for a log scale (he says measure diameter and it converts to area - that is a 'square' or geometric scale, not a log one).
You might have to zero (one) it on something and see how much the needle moves when you put a 1/2" gauge block under it. Then set it to 10 with the same block under it and remove the block and see where the scale ends up.
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