OPA 28 Concentration Indicator Test Strips 50 Per BottleOPA 28 Concentration Indicator Test Strips are used to measure the concentration of orthophthalaldehyde (OPA) in a solution. OPA is a disinfectant commonly used in the healthcare industry to sterilize medical instruments and equipment. The test strips help to ensure that the OPA solution is at the correct concentration for effective disinfection. They are often used in hospitals, clinics, and other healthcare settings to monitor the OPA levels and