Glass, 10-inch thermometer reads in 1° increments. Not for use in boiling liquids.
Reads in Celsius and Fahrenheit (-18°-104° C, 1° increments; 0°-220° F, 2° increments). Float it in a mash and leave it to equilibriate for convenient readings. Not recommended for boiling temperatures.
It does what is say and is pretty basic. Takes a minute to get used to the way the temperature graduations are labeled but it seems they are like that for convenience and not really an issue.
I don't use it as often as my lab and dial thermos. The response time is slower so you can decide what practical use to assign this piece of hardware.
Im tired of loosing my thermometer in the mash tun. This thing does the trick!