Due to the COVID-19 pandemic, body temperature checks have become routine for people entering public spaces such as hospitals, office buildings, and airports. Visitors pass through checkpoints one at a time, as workers aim hand-held laser devices at everyone’s forehead to check for fever. Smartphones with thermal imaging cameras could be useful thermometers. As Guideir’s thermal smartphone camera can detect a range of heat changes, it can be used as a guide to detect elevated body temperatures as well. https://www.guideir.com/