For the geeks, maybe some can use it. Cheap SQ-521 sensor (only) SDI-12 protocol

oreo54

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oreo54

oreo54

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At $50 and microprocessor controlled par sensor maybe someone can use it..
https://www.ebay.com/itm/3259617212...LNevKlGCw5CglqYPirLgO5LiGFYcFfJBoCbhYQAvD_BwE

Worst part is probably getting/making the cable.
Pics show the nylon screw. Apparently needed to avoid galvanic corrosion of aluminum threads.

Anyways "as is" I guess..
More tinker for the toy...

 
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