Browne's tube is used for -
Steam sterilization
Radiation
Chemical sterilization
Filtration
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.
General Microbiology Pa-2 and Pa-3 (Sterilization and Bacterial Genetics)