Purchased to find a leak in the main supply sprinkler line. I connected the red wire to the common disconnected sprinkler wire and the black wire to the panel ground. I managed to trace the pipeline around the large yard to the farthest valve box and found a leak along the way. Only 4 stars because it didn't come with a user manual or manual, I got that from the description of another similar device and I still don't know what the 'Status' LED is for.
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