Home Growers Guide Products Dosage Calculator Buy | Profile | Partners Downloads Sitemap Contact

Tel/Fax (+61) 8 9314 7595


Accuracy problems with pH meters

Even if pH electrodes are properly calibrated, do not assume they are always accurate. The reality is that different pH meters occasionally give different readings on a given sample even when each is calibrated on the same set of buffers.

The existence of pH meter error can be determined by measuring a nutrient sample using two different pH meters. With this exercise it is not uncommon to get pH readings that differ by up to 0.5 pH units. This occurs because some electrodes can respond to other 'species', such as sodium, which are electrochemically similar to hydrogen ions.

[Growers Guide Main Index]

Related topics:

"pH Measurement & Control":

Optimum pH of nutrient solutions | Adjusting nutrient pH | Measuring pH with 'indicators' | Measuring pH with pH Meters

Calibrating pH meters | pH meter maintenance | Accuracy problems with pH meters | Buying a pH meter