SOUTHBOROUGH, Mass. — Kaz on Thursday introduced its new Vicks behind ear thermometer (V980), which takes the guesswork out of measuring for fever. Using patented technology, the Vicks behind ear thermometer features rapid one-second readings, and is one of the first thermometers designed to measure temperature from behind the ear — a gentler, noninvasive approach to detecting fever than rectal, under-the-tongue and forehead measurements.