ph alarm

[atty]

just have a little problem atm with my Profilux Plus II Ex Ph alarm. The Ph reading is three stars ***, and theres no function for calibrating. I calibrated the ph probe about 6 months ago but then packed it all away. when i first put the probe in my tank last night it read a ph of 10, and then dropped all the way down till the three stars came up and the alarm kicked in. Has the Ph probe expired?

[Matthias]

*** indicates a problem with the probe, maybe it became too dry during the 6 months or the cable/plug is damaged
in these cases the calibration menu disappears -> there is no point for a clibration of a defective probe