Welch Allyn Set of Four Reusable Otoscope Specula is a set of four reusable otoscope. The reusable otoscope set consists of four ear specula: 2.5, 3, 4 and 5 mm. Each reusable specula in this set is meant to be used for Diagnostic and Macroview Otoscope. The reusable specula can be cleansed by autoclave, boiled or sterilized in a solution. The reusable set is lightweight but also durable at the same time.