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What is a good pH probe for fieldwork on freshwater ecosystems?

Question asked by JMcClellan on Jul 22, 2016

I am a high school science teacher doing citizen science research on a nearby lake and river. We have tried using Vernier LabQuest2 with their pH probes, but have had a lot of inconsistencies, even with regular calibration. I borrowed a Hach probe that a chemistry professor lent us and seem to be getting better results. These are obviously very expensive. I can try writing a grant for one if this is an important indicator of health of the water, but I don't want to spend $800 on equipment only to find out that the pH is pretty consistently close to 7. Are there any lower cost but accurate instruments for fieldwork? I'd like something that is accurate to the nearest hundredth and is student-use friendly. (In other words not something super technical or breaks easily.)