I have a HM Digital DM-2 TDS meter that I don't need anymore, it comes with 2 sets of probes, calibration solution, and the monitor. It needs to be calibrated and that is the reason I am selling it, it is just to hard for me to calibrate. One set of probes and the solution aren't even a week old and are $30 alone. I am going to sell this for $30 plus shipping.
Jarred
Jarred