Indicators for autoclave monitoring Bowie-Dick disposable test pack Bowie-Dick disposable test pack. Heavy-metal-free indicators for daily air extraction and water vapour permeability test according to DIN EN 17665. Meets EN 867-1 1997, EN 867-4:2000, ISO 11140-1:1995 and ISO 11140-4:2001. Simple interpretation and fault detection through colour change from blue to pink, as well as non-reflective surface. No subsequent change of colour for safe storage and transparency of results. Reproducible.