Sorry I know it is not an answer to your question, but I have heard from Several Pediatricians that these are not reliable for taking kids temperatures.
Just an FYI..
im not sure what u mean by reliable, usually when i feel that im under the weather and i check it with the ear or sensor thermometer, it tells me from 100 degrees +. i dont think it makes a diff if u have 100.2 or 100.7 ur still sick, and anyways how off do u think it is?
if u have 103 + then u should start getting worried, but these thermometers arent off by a full degree