God damn..these ph/ec pens are giving me the shits..thought I’d recalibrate the pen as when I mix a+b it says 720ppm after a quick stir.pull it out of nutes.put it back in and stir again just for a sec or two. Check…680ppm..do that a few more times it’s down to 600ppm .the reading should b stable not dropping..ph reading is solid..that doesn’t move..so I use an quick cal satchet to calibrate…wrong comes up and that means either change the solution or clean pen so I did both …used another satchet…same result

so I try the 2 point calibration and select std cal on the pen..use the 7.0 first ..up come rec ,which means it recognises it .okay 1 comes up….cool.. do 4.0. Yep that works .okay 2 comes up..now for the ec..nope…wrong comes up…so I guess the ec probe is up the shit..it’s probably been like that right from the beginning as it was out 200 ppm when I calibrated it for the second time since I’ve had it….so in the space of 3 weeks I’ve calibrated it 3 times…well twice really cause the fucking thing won’t calibrate now…pen has always had storage solution in the cap so the pen probes should b pretty clean with only 3 weeks use..now I have to guess how much ppm I’m giving them till I have another meter.the cheapo ph pens gonna have to do the job till it’s fixed or they give me another.400 buck pen lol

.ph is more important than nutes as I can just watch them..have a little tip burn which is why I wanted to recalibrate the pen..I was most likely giving them 720 ppm .