I just bought the combo ph/ec from blue lab…cost way too much up in Canada but I can say it is worth every cent. I have spent equal money on a ton of pens and should have bought the good shit initially.
Bluelab METCOM Combo Meter for pH, Temperature, Conductivity (Nutrient) in Water with Easy Calibration, Digital TDS Tester for Hydroponic System and I Amazon.ca
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