Surely the best choice of ear thermometer and it's certainly not for nothing that it is exactly the same model (IRT 4520) that is found in almost all hospitals, clinics, maternity, etc. It is not as accurate as a rectal thermometer but is very practical first step. By cons, we must position the otherwise reliable fall. A tip: make several measurements. For those who ask the question of the difference between 4020 and 4520, it can store over temperature taken (8) and comes with a convenient storage base to store the bits inside.