Measuring pH sounds simple, but the right method depends entirely on your water. Answer two questions and get the approach the science actually supports — and the honest caveats that come with it.

1 How would you describe your water?

2 What do you actually need to know?

Want the full reasoning? Read how every pH method works, and where each one fails — a peer-reviewed-sourced breakdown of glass electrodes, ISFET, drop checkers, spectrophotometric pH and inference from KH.