Rurumo
Well-Known Member
The only PH pens that have lasted well for me were kept in KCL storage solution at all times. I agree with OldMedUser that quality matters, ESPECIALLY with PH meters. EC/PPM meters are a lesser technology, but I still think we should get decent brands for each because they are so important. I've had a crappy PH pen almost a ruin a grow back in the day.