ph calibration solution

[Paaty]

I need to recalibrate my milwaukee ph caontroler although I can't remember which solution to buy. is it ph 4, ph 7, or ph 10. thanks in advance

 

[m2434]

The stuff they sell on the marine sites appears to be absurdly expensive. Try a scientific supply co.
Here is one example, the pH 7 solution is <1/2 price compared to marinedepot. But search around.
http://www.omega.com/pptst/PHA4_7_10.html

Most meters use pH 7, this is a standard and you can use any fluid. Unfortunately, I've noticed other meters use pH 7.01, I believe the sole purpose of this is to try to force you to buy their overpriced solution. But again search around.

 

[steve the plumb]

I had the coralife ph calibration fluids(in a bottle) and they don't work properly.Once you expose the fluids to air you can't use them again.I don't know about these since they might be a better quality.I see they have single use packages $18 for 20 tests that is a good price.From what there price is you can save around $5 unless you buy the small bottle

 

[arts007]

For your meter use pH 7 and 10, the package may say 7.01 which is the pH at a specific temp

 

[LobsterOfJustice]

If you are using the controller for a calcium reactor you want to use 4 and 7, otherwise use 7 and 10.