I need a watch that tells your temperature

[MisterGrey]

Later this summer, my mother's going in for a bone marrow transplant to treat her leukemia. As part of the transplant, she has to stay within fifteen minutes of the hospital at all times for thirty days in case she develops a fever, in which case she needs to be hospitalized immediately. During one of her most recent visits to her oncologist's office, another woman in the waiting room was wearing a wristwatch that had the ability to tell her internal temperature. My mother asked her where she got it, but the woman said it was a gift and couldn't remember where the person who got it for her said it was from. Does anyone have an idea where I can pick one of these up? Aesthetics aren't much of a question so much as function, so if it's only available in mens' or has a masculine appearance, that isn't too much of a concern.

Thanks!