ThegrowerMOJO
Well-Known Member
This isn't what i was reading but stumbled across it looking for it > http://www.flairform.com/hints/ph_meter_accuracy.htm and here is another one that shows temperature also effects the pens and probes ,not arguing but drops are so much easier in the long run. scroll to the bottom >http://necfe.foodscience.cornell.edu/publications/pdf/FS_Purchasing_pH_Meters.pdf