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Thanks for the info Brian. I heard they were switching cable outer jacket colors soon, and a few of our workshop attendees last month received Hydros 21 sensors with black cable instead of the usual red, so I’m assuming the inner wire color changed too. Their soil moisture sensors also changed inner wire colors a few years ago, and the manual shows both options. It’s always good practice to double-check with a manufacturer if it’s unclear what wires to connect to a datalogger because some sensors can be damaged by connecting them to the wrong pins. The Meter Group sensor seem to be pretty hearty and I haven’t accidentally broken one by connecting it wrong, but I’ve used other sensors that were immediately bricked by hooking it up wrong.