Review on Macherey Nagel 92110 0 14 Indicator Strips by Tim Airy

Okay I'm sure there are a few dozen people who have bought these and don't know how to use them or don't understand them pH scale. Basically, if you want to measure pH accurately by any method you need to calibrate your detector, and when using these strips your own pair of good ol' Eyeballs Mk are your "detector". 1. Everyone sees colors a little differently, even those who aren't color blind. So in order to read these things properly, you need to test some of these strips in known pH solutions to calibrate your color vision with the box. I tested these strips at 4.0, 7.0 and 10.0 using known buffer standards and found that FOR ME the second color (green) is slightly different. After figuring out what to expect (in other words, calibrating myself), I found this product to be quite suitable for routine lab work. With these I prepared buffers that matched the electronic pH meter readings and gave the expected values predicted by the Henderson-Hasselbalch method.