INFO:
To test its pH, collect a sample of water in a small, clean container. Once you have your sample, prepare your probe by running it under clean water, or take your litmus paper out of its packaging. Then, place the test in the water. For litmus paper, a few seconds in the water will normally produce a clear reading. For a probe, wait until the reading on the screen is steady. Finally, compare the litmus paper to the chart on the packaging or read the measurement on the probe.
Video: How to Measure the pH of Water - wikiHow