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That looks like a coaxial soil PH meter with the dial sticker changed? I think these are a probe tip made of two different metals and an analog volt meter movement.
Image stolen from: https://www.harrodhorticultural.com/uploads/images/products/GRE-514_large.jpg
"Put your helmet on, we'll be reaching
speedsfertilization of 3" - MST3K (Altered)Good god, that's a deep dive for making a comment on an old post!
