The Green Card T Air Removal and Steam Penetration Test is designed for daily monitoring in small pre-vacuum steam sterilisers operating at 134°C for 3.5 minutes to detect the presence of residual air. The pouch packaging prevents the indicator card from being exposed to excessively wet steam conditions that are sometimes present in small steam sterilisers. The Green Card T indicator will change from purple to green when exposed to a steam sterilisation cycle with acceptable vacuum cycles.