New sensor called FaceBit can tell if health mask fits properly and provide other data. Designed for workers, device also could benefit public eventually.

A new smart sensor that measures face mask fit may come in handy for workers who need to know their masks are working, Northwestern University researchers say. [ FaceBit ][5] , as it is called, also measures heart rate and respiration, similar to the fitness wearable Fitbit, but with special attent...