Use pH test strips or litmus paper
Collect a small sample of the liquid or substance you want to test
Dip the test strip into the sample or place a drop on it
Wait for the color to change
Compare the color to the chart provided with the strips
Use a digital pH meter for more precise results
Calibrate the pH meter before testing
Rinse the probe with distilled water before and after use
Insert the probe into the sample
Read the pH value displayed on the meter
Test saliva or urine only if instructed by a healthcare professional
Follow the instructions on the testing kit exactly
Repeat the test if the result seems unclear
Record the pH result for reference