Just got This HI 98129 PH + TDS + Temp meter the other day. Also got all the calibration solutions, PH probe cleaning solution, and PH storage solution. Cap for the probe has a small sponge that holds the PH storage solution.

So far, seems to be a very good product, we shall see how it holds up and maintans calibration?

If nothing else, I feel far more confident in testing my RO/DI TDS with this instead of the cheap inline crap that comes with the RO/DI units. Post RO = 11, Post DI = 1