Calibration Solutions

PotomacBoater · July 24, 2012

I want to calibrate my PH and Conductivity probes

but the shipping alone from Neptune is almost $15

do LFS's carry it

or is there a cheaper place to get it???

Thanks,

Matt

Origami · July 24, 2012

pH calibration solution is common. You may find conductivity solution, too. Call first. I'm sure I've seen some at both BRK and F&F.

zygote2k · July 24, 2012

i have some extra if you want it.

bill stine · July 24, 2012

got mine on ebay, 3 packs for $2.99 + $2.99 shipping for a $5.98 total

Here has standard 4.0, 7.0, and 10.1 solutions

Origami · July 25, 2012

got mine on ebay, 3 packs for $2.99 + $2.99 shipping for a $5.98 total

Here has standard 4.0, 7.0, and 10.1 solutions

^^Great price. Milwaukee makes good calibration solutions, too. Nice score.

PotomacBoater · July 27, 2012

PH is easy to find, its Conductivity I've had a harder time getting.

BUT

What do you do when your conductivity probe is reading low (6.0)?

2 hours of soaking the probe in vinegar, and now its back to 52

;-)

Thanks for all the help!

bill stine · July 27, 2012

Origami · July 28, 2012

Actually, in this hobby you want to use a 52 mS/cm calibration solution for high conductivity probes.

Randy Holmes-Farley wrote a nice little article some years ago where he gave formulas for some DIY salinity standards. Here's the link

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