On 14/11/2020 19:44, michael adams wrote:
Clip On Hot Water Pipe Thermometer 0-120C 63MM Temperature Gauge

https://www.amazon.co.uk/Thermometer.../dp/B01N8SQS54

Which goes up to 120C Which suggests the pipes themselves can exceed
the temperature of boiling water which is 100C. Most other pipe
thermometers seem to go to 120C as well. Not that I'd claim to
understand how this makes any sense.

Possibly it's intended to cope with pressurised steam pipes. They really
burn if you touch them. Or it might be a basic design also used for
other products, such as asphalt thermometers.

Bill