I have a millwalki, and store it in ph7.0, my friend uses distilled H2O. I don't think it matters just don't let it dry out.
but then they make some that are sold as continous reading??
better send a note to the mfg.
Daddynobucks Reviewed by Daddynobucks on . Ph meter Does the tip need to sit in the buffer solution or distilled water? Rating: 5