Dual temperature TST strips (Time/Steam/Temperature), for use in autoclaves. These class 6 indicator strips provide validation that the 3 critical parameters of an autoclave sterilisation cycle have been achieved, by means of a visual indication of a successful sterilisation cycle. Easy to use – simply place in the autoclave along with the articles to be steam sterilised. A successful sterilisation cycle will be indicated by a colour change on the strip from yellow to purple. Suitable for use with the following cycles: 134°C for 3.5 minutes and 121°C for 15 minutes. Supplied as a pack of 100 test strips.