Been getting some what I suspect to be nute burn on seedlings at about 3 weeks from seed 0.5 ec and 6 ph.
Decided to check my newly cleaned 18 month old Bluelab truncheon with Vitalink calibration fluid.
It says the truncheon does not need and in fact can't be calibrated yet when placed in the calibration fluid it reads 2.5 touching on 2.6 in the fluid it should be reading 2.8, so what is out the fluid or the truncheon. Anyone use a calibration fluid they know to be stable.
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