well i took it to my hydro guy.....and I don't know what he did but he got it calibrated and told me to try it again......don't ask me what I'm doing wrong because it's supposed to be foolproof.....good thing I'm not a fool, huh? LOL!!

Anyway, I wouldn't worry if I were you....he mentioned to that usually they are very easy to calibrate and he had hadn't seen someone who couldn't get it to work so I believe you are safe Opie (ps....he said generics solutions should be fine to use btw as long as they are fresh) but I have terrible fears of the same thing happening again....
Weedhound Reviewed by Weedhound on . Rhizome/Opie/Anyone who uses Truncheon PH Meter Help!!! I can't get mine to calibrate lately! I've tried cleaning the probe, and even changing the contact ring (only had it about a month....:() but I keep getting that flashing green 5. It calibrates to the 4.0 solution I have (made by BlueLab) but not the 7 (made by Hanna) although it DID calibrate to the hanna solution previousyly. Any tips? I use new solution each time and check it once a week, keep the cap with 4.0 solution damp on the sponge and rinse the probe each time I use it. HELP!! Rating: 5