These durable thermometers are great for elementary and middle school students to use when measuring temperature, especially since they go from below 0 to above 100 degrees Celsius. I have also used them for 100th day of school activities when measuring ice, cool water, room temp. air, hand temp., boiling water, and steam. For the elementary grades, I recommend coloring in the below zero areas with blue sharpie, so they do not get confused with below 10 degrees and above 10 degrees or even covering up the Fahrenheit side with masking tape to only measure in one scale.

Apparently it's simultaneously 16° and 24° on my desk. I'm not sure how I'm supposed to have my students do a science experiment where they compare outdoor temperatures between sun and shade when the thermometer is utterly unable to give them any data. Useless rubbish!