Chemical Integrators offer an immediate, accurate and easy-to-read method of monitoring sterilization process conditions inside each park. "Moving front" style has accept/reject readout for instant results with easy interpretation, convenient small size for all packs with optional extenders available for easy retrieval from inner packs.- Chemical Integrator w/ Extender, 9" x 0.7", 500/bg, 2 bg/cs 14-21 Days