RobGee said:

Not exactly sure where to post this, but I've been having some deficiency issues and I believe it's Ph related. I have 2 testers, a Hanna handheld and just picked up a Bluelab handheld. After I calibrate them I drop the probes into my rez and I'm getting a difference of at least .3, sometimes as high as .6 with the Bluelab meter always showing the higher # (right after both show 7.0 in the reference solution). Any ideas?

Thanks

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Seamaiden said:

But they both calibrate to the same point(s)? Are you using the two-point calibration method? If so I would agitate the reservoir a bit more and see what happens, then pick a meter to use and stick with that one. If not, then I think you should be using the two-point calibration method first, just to be sure they're both calibrated to the exact same pH points.

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Seamaiden said:

Yes, using the 4.0 and 7.0 points.

I'm at a loss, then. Clearly there's a difference between the two probes, but I'm not sure how I would address it beyond calibration. I would probably get on the horn with the manufacturers, then.

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Tnelz said:

I've been using blue lab forever and def can speak to the quality of it. U will drive yourself nuts looking to both of them. Many moons ago I had the same problem because I was trying to use both my blue lab and Milwaukee martini. Ditched the Milwaukee and trusted my blue lab and never have a problem to this day. Long as ur using the two point cal as seamaiden said I'd be vey comfortable trusting the blue lab. Good luck brother

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jinxjj said:

Bluelab are pretty expensive and decent quality right? How much was the Hanna and what kind of reputation do they have?

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