The CRY3711-S01 ear simulator set simulates the way an earplug conduit is inserted into the ear canal or auricle to measure headphone performance.
CRY3717-S01 is a 6cc coupler set specifically designed for acoustic testing of circumaural headphones.
CRY3718-S01 is a simulation ear set specifically designed for measurements in audiology and related fields.
CRY3719-S01 is a 2cc coupler set designed specifically for audiometry and acoustic testing of insert earphones.