Trophon Chemical Indicators, Red to Yellow, Sonically Activated Hydrogen Peroxide 300/BoxTrophon Chemical Indicators by Nanosonics Inc. are advanced, single use monitoring strips designed to independently verify the efficacy of every trophon high level disinfection cycle. Specifically engineered for use with sonically activated hydrogen peroxide in the trophon2 system, these indicators provide instant color change from red to yellowdelivering clear, qualitative confirmation that your disinfection process achieved the required conditions.