Ph meterChoosing the Best pH Tester The pH meter measures the acidity of a solution and can help determine whether it is safe for human consumption. It uses a litmus paper to measure the concentration of hydrogen ions. The litmus paper turns different colors in solutions of pH 1–14, which can be read by comparing it to a pH chart. The meter is capable of measuring the pH level of a wide range of liquids and solids, including foods. The pH meter needs distilled water to operate and must be calibrated. It measures the pH of a solution by using an electrode in its tip. Cheaper meters don’t have this electrode and must be replaced frequently. If you are unsure of the pH of a solution, you can use paper pH strips which are easier and cheaper to use. However, a cheap meter may not have the correct resolution. A proper PH metre must have a calibration function to ensure accurate readings. The pH meter is a device that helps you determine the acidity of liquids and solids. It measures t...