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1 comment of this product found across Reddit:

wolphcry /r/aquaponics

1 point

1970-01-16 21:09:51.906 +0000 UTC

Or the tri model ? http://www.amazon.com/ND1100042-Nutra-Dip-continuous-meter-Temperature/dp/B0001XGQ2C These are the cheapest digital continues PH meters I have found.