The 3M Attest Rapid Readout Biological Indicator is designed for quick, reliable monitoring of steam sterilization cycles. Featuring a brown cap and Geobacillus stearothermophilus, it provides a final visual pH color change readout within 3 hours. Compatible with 121°C (250°F) gravity and 132°C (270°F) vacuum-assisted cycles, it supports consistent quality control in autoclave workflows. Supplied in a convenient 50-unit box for busy veterinary clinics, animal hospitals, grooming facilities, and lab environments.