What do you store your pH probe in? RO water, saline water, tap water or something else?
rdnelson99;985867 wrote: Reading the Apex manual they say tap is fine.
SnowManSnow;986036 wrote: so if it dries up is it ruined? or is it hit or miss?
Barrettrhoades;986282 wrote: Long term storage should be in a pH calibration solution. Either 4 or 7. Doesn't matter.