Ear Thermometer Lens Filters are designed to use with all Braun Ear Thermometers (not included). Lens filters provide a reliable way to minimize the spread of germs between each use. Disposable design ensures hygienic use without having to clean or disinfect the sensor, virtually eliminating cross-contamination. They are BPA-free and perfect for infants.Ear Thermometer Lens Filters are designed to use with all Braun Ear Thermometers (not included). Lens filters provide a reliable way to minimize the spread of germs between each use. Disposable design ensures hygienic use without having to clean or disinfect the sensor, virtually eliminating cross-contamination. They are BPA-free and perfect for infants.