Use the thermometer a half years old since my little one and I find it a relief for quick fever checks in between. He makes it easier than indulge as rectal.
But I think it goes in terms of accuracy nothing about the rectal measurement, as recommended by most doctors.
A Little Hint:
I was the IR thermometer of the ENT doctor recommended because you can easily otitis media can control (because of the effusion) thus using the different tympanic temperature.
We also use a cap per person, anything else would be pure waste in the private sector.