Browne's tube is used for -
Brown's tube is the most commonly used chemical indicator of moist heat sterilization in the autoclave. It contains red solution that turns green when exposed to temperature of 121degC for 15 minutes in an autoclave.
Steam sterilization
Radiation
Chemical sterilization
Filtration
General Microbiology Pa-2 and Pa-3 (Sterilization and Bacterial Genetics)