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Calibrated Bluelab Equipment showing different EC's / pH's

Hydroponics / Aeroponics
Calibrated Bluelab Equipment showing different EC's / pH's
Hey Guys,

I'm having some weird issues, or maybe it's me? I thought bluelab was the best equipment out there, so I bought myself a couple of pH dosers and some guardians....

Now the first issue I had was with my first guardian which I'd been using for about 2 years. I noticed my new plants were getting nute burn, but the EC was only 0.6. I bought a second one as a spare and hooked it up and found the EC on the new one was showing 0.8 in the same solution. I got out my ppm calibration...

Calibrated Bluelab Equipment showing different EC's / pH's

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