The TC3 Carbon Monoxide Capsules are designed for use with the Testifire 2000 series detector testing unit. Unlike the standard pressurised canisters / aerosols, the Testifire creates CO stimuli on demand using non-toxic liquid based capsules which generate the test CO once a detector has been registered in the Testifire cup.
 
This ensures detectors are not over exposed to test gas, prevents waste and ensures that you can test more detector heads with a single refill