For accurate and more hygienic temperature monitoring. Braun disposable lens filters enable accurate and hygienic temperature taking. It?s 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. What?s more, fitting a new Braun lens filter each time ensures that dirt or ear wax don?t build up and clog the sensor window, which could lead to inaccurate temperature readings.