These test strips provide a rapid and easy measure of the MEC to enable optimal reuse of CIDEX OPA Solution for high-level disinfection.The ortho-phthalaldehyde concentration of CIDEX OPA Solution during its use-life must be verified by the CIDEX OPA Solution Test Strips prior to each use to determine the MEC of 0.3% is present. CIDEX OPA Solution is reusable for up to 14 days when monitored with CIDEX OPA Solution Test Strips. (15 per Bottle, 2 Bottles per Case)