Infrared thermometer: <a href="https://en.wikipedia.org/wiki/Infrared_thermometer" rel="nofollow">https://en.wikipedia.org/wiki/Infrared_thermometer</a><p>Thermography: <a href="https://en.wikipedia.org/wiki/Thermography" rel="nofollow">https://en.wikipedia.org/wiki/Thermography</a><p>IDK what the standard error is for medical temperature estimation with an e.g. FLIR ONE thermal imaging camera for an Android/iOS device.
<a href="https://www.flir.com/applications/home-outdoor/" rel="nofollow">https://www.flir.com/applications/home-outdoor/</a><p>I'd imagine that sanitization would be crucial for any clinical setting.<p>(Edit) "Prediction of brain tissue temperature using near-infrared spectroscopy" (2017) Neurophotonics
<a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5469395/" rel="nofollow">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5469395/</a><p>"Nirs body temperature" <a href="https://scholar.google.com/scholar?hl=en&as_sdt=0%2C43&q=nirs+body+temperature" rel="nofollow">https://scholar.google.com/scholar?hl=en&as_sdt=0%2C43&q=nir...</a><p>"Infrared body temperature" <a href="https://scholar.google.com/scholar?hl=en&as_sdt=0%2C43&q=infrared+body+temperature" rel="nofollow">https://scholar.google.com/scholar?hl=en&as_sdt=0%2C43&q=inf...</a><p>"Infrared thermometer iOS"
<a href="https://m.alibaba.com/trade/search?SearchText=infrared%20thermometer%20ios" rel="nofollow">https://m.alibaba.com/trade/search?SearchText=infrared%20the...</a><p>"Infrared thermometer Android" <a href="https://alibaba.com/trade/search?SearchText=infrared%20thermometer%20android" rel="nofollow">https://alibaba.com/trade/search?SearchText=infrared%20therm...</a>