PH meters on McMastercarr?

You should have posted the link to the actual page or mentioned the model your are cosidering, there are 3 pages of meters there. That said the first one looks like a Hanna pHEP, but the accuracy spec is odd; pH is a log function and it's speced in a linear value. I did not want to go to the effort of converting it since the cost makes me wonder how good it can be.

You want an accuracy of at least 0.1 pH units, preferably better, resolution of pH 0.1, preferably better.

You can get good meters at Fisher Scientific, Cole Parmer, Sargent Welch and most winemaking stores also. Since the McMaster Carr catalog has drawings I really can't tell what the are, but it looked like a few might be good enough.

If this is a hobby meter you should be able to find one you want for under $100 US, if it's for a professional setup a good bench meter is usually under $300 and you can pick your probes and replace them as needed.

Don't forget you need calibration solutions, the cheapest way to go there is to find a source for Hydrion capsules, they are added to

100ml of distilled water to make the buffer solutions so you get what you need when you need it.

The cheapest meter I know that fits the bill is the pHEP 3 at around $50 US, the pHEP5 is much better for around $70 from Grainger or Hanna. There are lots of othe manufacturers out there and it really depends on what you want to spend. The more you spend the more you get usually.

Hope that helps. Regards, Joe

Joe, I didn't post the question, but yes it did help. Thanks for your answer.

All the best,

-- KB St. Charles,MO

"Change is the law of life, and those who look only to the past and present are certain to miss the future."