pelochas
Member
eclecticvibe said:That reccomendation is per all pH probe manufacturers that I've talked to. I'm not sure that it's 100% necessary, and I tend to calibrate more along the lines of every 6 weeks. From my understanding, pH calibration fluid can't be stored once it has been opened. It immediately begins to change pH levels once exposed to the air.
so this means we should have roughly 9 packs of calibration fluid for a years worth.