Probably Due To Network Congestion

After my last two Imperial Stout Brewdays and peoples comments on efficiency and extraction, I thought I would test my thermometers.
Below are tests with a jug full of Ice & Water for the ZERO point and a pan of boiling water for the BOILING point.

The test subjects:

The Cold Test

All submerged in Ice Water:

My Cheap, from Hong Kong, regular brewday Thermometer in Ice Water reads 0.5c:

The glass spirit thermometer reads -2c in Ice Water which I was quite surprised at:

Another Cheap Hong Kong food thermometer reads 0.9c in Ice Water:

My £15 ebay purchased Thermamite 5 reads 1c though it only reads in 1 degree increments:

The Hot Test

The Thermamite 5 reads a 100c, which feels reassuring:


Cheap Food thermometer reads 99c:

My regular brewday thermometer reads 100c too:

The spirit thermometer reads 100.5c:

A fair range of inaccuracy but at least I know the ones I’ve been using are about the more reliable 🙂