I had that one that nook pointed you to for a long time. The only Issue I had was where I mounted it I was always wiggling it around and the wires eventually broke at the top of the meter. If you get that one mount it and don't move it.
I cannot find a link to the one I have now but it has a back light which lets me check the TDS after lights are out without having to flip a bunch on switches in the basement. Completely unnecessary but nice I suppose.
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