Building an IR Thermometer That Fits on Your Keychain https://hackaday.com/2024/07/05/building-an-ir-thermometer-that-fits-on-your-keychain/ #3Dprintedenclosure #Microcontrollers #IRthermometer #oleddisplay #ToolHacks #esp32-C3 #keychain

Turns out infrared thermometers don't get the temperature of water right.
Alerted to this when dying a shirt.
IR thermometer said 85°C - while I wondered why the water was gently bubbling.
Digging out a mercury thermometer revealed why - it was at simmering at 100°C.

The shirt still seems to have dyed okay.

Any physicist care to explain?
#PhysicsMastodon
#PhysicsQuestion
#IRThermometer
#TheNeedForPurple

https://dasnetzundich.de/das-google-pixel-8-usb-c-display-output-und-vieles-mehr/