Amazon has a great "Boiler Thermometer" with a probe on a 33 ft wire for $16. I really like mine. It's amazing how much temperature difference there is in 2 ft of water compared to 16 ft.

Use search words on Amazon
Digital Thermometer High-Temperature Industrial Boiler Electronic Thermometers 10M Wire with Probe Temperature Sensor

Last edited by Bill Cody; 10/10/24 07:56 PM. Reason: added search words