| Re: Need to calibrate my PH meter yeah, I dont think using your tap water is a good calibration solution because it varies depending on where your at. I second the notion of 4.0 cal. solution also, because its more acidic and will keep your probes clean.( if your meter can cal at 4.0 also, some meters can only be cal'ed at one range so check yours). good luck man!
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organic for life. Photo:Purple Kush- 5 weeks into flower.
vaporize! your lungs will thank you!
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