Installed on the reverse osmosis system I use for my reef tank. The sensors were placed on the raw water lines, the reverse osmosis water lines, and the reverse osmosis/diaeration finished water lines. I had no problems with the installation. The kit includes all the connectors required for installation. All you have to do is cut the existing leads where you want to get a TDS reading and connect the probe connectors. The TDS reading matches that of my portable meter.
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