Braun 40-Pc ThermoScan Lens Filters Ear Thermometer IR4520 IRT3020Overview: For accurate and more hygienic temperature monitoring. Braun disposable lens filters enable accurate and hygienic temperature taking. Its important that the Braun ThermoScan lens filter on the temperature sensor is replaced every time a reading is taken. Disposable lens filters ensure hygienic use without having to clean or disinfect the sensor and virtually eliminate cross contamination. Whats more, fitting a new Braun lens filter each time