My TDS meter is not functioning properly so I need to purchase another. I have a separate pH tester but was looking at just ordering a combo unit. Seems like my pH pen takes forever to stabilize. I use them for my Crystal Shrimp tanks and RO water monitoring.
I don't want to spend a crazy amount of cash but wanted to know if anyone has had experience with Hanna Combo Pen - pH/EC/TDS/Temp, Model #HI 98129. If so, is that the model I should purchase ? There are 2 models, HI 98129 and HI 98130. One reads high and one reads low EC ranges.
Thanks for your help!