High accurate - filters protect the lens from scratches and impurities which might affect the readings. Virtually eliminates the risk of transferring germs. Lens filters must be replaced after every reading to ensure hygienic and accurate results. Each outer box contains 10 boxes of 20 covers Fit Braun IRT and Welch Allyn Thermoscan thermometers, including: Welch Allyn Pro 3000, Welch Allyn Pro 4000, Welch Allyn Pro 6000, Braun IRT4520 Thermometer Helps prevent cross-infection. 00732094314649 5060945738470 ukmedi