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I dropped my £6 ph pen in the res tank some months back.
I replaced it with a more expensive one. I noticed the expensive one was drifting out of calibration, so I picked up the old one from where it had been left, it'd had dried out, it worked and it was in calibration!
Welcome back my faithful chinese friend.
I replaced it with a more expensive one. I noticed the expensive one was drifting out of calibration, so I picked up the old one from where it had been left, it'd had dried out, it worked and it was in calibration!
Welcome back my faithful chinese friend.