Thermometer Sheaths Mercury-Oral 100/Bx Simple use eliminates the need to disinfect or sterilize thermometers. Protects both patient and nurse from contamination. The entire procedure is convenient, easy and safe. Sterile. The original thermometer sheath with optional tear-tab. Latex-free. Formerly known as Sani-Therm. Disposable sheath maintains hygiene by eliminating cross contamination. Specifically sized to fit digital thermometers.