* Pure water: While distilled water is technically pH 7, tap water and other natural water sources can vary slightly due to dissolved minerals.
* Human blood: Blood is carefully regulated to maintain a pH between 7.35 and 7.45.
* Neutral saline solution: This solution is often used in medical settings and has a pH of 7.
Important Note: It is difficult to find substances that are *precisely* pH 7. Many substances can be close, but pH is a continuous scale, and slight variations are common.
