Cole Parmer Combination Electrode Refillable Double Junction Review

I use these to maintain pH in my pool. I've always used calomel probes, but they're getting harder and harder to find due to mercury phobia. It's time to find a replacement. I calibrate my sensors in a buffer that has been heated to the same temperature as the spa (96F) for maximum accuracy. For comparison, I also run three meters at the same time. In short, after considering all available options, he settled on three candidates; this compared to 55510-06 and 05991-22. The 05991-22 actually…