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- Whatever s in my jars
next time you have spare money buy yourself a bluelab truncheon it will be the only ec meter you will ever buy i bought all cheap brand ones at first and replaced them in the endCheers, I've seen quite a few different conversions though and lord knows what this cheapo TDS pen is using as a base. I usually just go by ml/L but putting up the PPM info for others given this is a tester