The pH meter is fine and seems to be holding a decent true reading after calibration. One thing that frustrates me is that your calibration scale is different than most others. 4.0ph 6.86ph 9.18ph use in ph buffer bags where the most liquid calibration solution is 4.0ph 7.0ph 10.0ph which absolutely corners you The only way is this to buy a pH buffer solution in a bag that also requires deionized water, which will set you back 24.99 gallons. This method is not nearly as fast and accurate as using the ph buffer liquid :( Now for the PPM meter I also bought, it seems accurate enough but I had to buy my own test liquid before using it so how to use this kit Not knowing what I know now I would buy the BLUE LAB Ph PPM Master Kit that's what I end up buying and lets just say the difference between day and night I hope , it helps someone, not about making the same mistake as me
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