T.S.T.--a new range of indicator devices for autoclaving processes

Simple process indicators, usually relying on a colour change, are widely used as an aid to user assessment of the success or otherwise of autoclaving processes. Ideally, a process indicator should be capable of indicating not only that heating in steam has occurred but that heating has been maintained at a correct level for a suitable period of time. Furthermore, it would be preferable if any colour changes were abrupt rather than gradual throughout the period of heating.