Nervous parents are an easy sell. That may be why Blue Spark Technologies is expanding its temperature-reading devices into human thermometers. The TempTraq adhesive patch goes under a sick child's armpit and monitors temperature for a little over a day. It sends temperatures to a parent's smartphone, and allows for easy export of the data — if, for instance, parents want to send it to their child's doctor.

Right now the FDA is reviewing Blue Spark's application for marketing approval. No information is yet available about pricing.