ECS SRL biological systems (BIO-CHECK) are conceived to control the effectiveness of the sterilization process. BIO-CHECK Biological indicators are recommended for the different sterilization cycles: steam. VH202, EO, hot air and formaldehyde. BIO-CHECK Biological indicators contain bacterial spores coated on a paper strip enclosed in a plastic vial along with growth medium contained in a crushable glass ampoule. The special filter cap allows sterilant to penetrate into the plastic vial. Certification is included in each box.