Monitoring the pH level of your kombucha brew is essential to ensure the right balance of acidity. The ideal pH range for kombucha is between 2.5 and 3.5. You can use pH test strips or a digital pH meter to measure the acidity level. If the pH level is too high, it may indicate an under-fermented brew, while a low pH level can result in an overly acidic brew. Regularly monitoring the pH level helps you achieve the perfect balance.