You could have some slow-to-dissolve residue in the kit block. If you want, leave them both filled with distilled water after each use, for a couple of days, and they'll probably clean out OK.
Re: False pH tests
You could have some slow-to-dissolve residue in the kit block. If you want, leave them both filled with distilled water after each use, for a couple of days, and they'll probably clean out OK.
Re: False pH tests
Thank you so much for your help. I appreciate it very much!
Re: False pH tests
You're welcome.
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