Once-A-Day® Vertos Bowie-Dick Test Pack is a fully disposable, eco-friendly, alternative to traditional Bowie-Dick test packs. Made without lead and heavy metals, Once-A-Day® Vertos Bowie-Dick Test Pack is completely biodegradable. Bowie-Dick tests provide a challenge for pre-vacuum sterilizers at the start of each day, or after routine or other maintenance. Once-A-Day® Vertos detects low temperature/pressure conditions, wet & superheated steam. Once-A-Day® Vertos Bowie-Dick Test Pack features easy to read blue to pink color change that will not revert during record keeping. For use in pre-vacuum steam sterilizers at 270-276°F.