Meter Vs. Metre

The words meter and metre confuses many people.

Meter: A meter is device that is mainly used to measure stuff. Barometer, thermometer, manometer etc are called meters. The word meter is also the American version of British English word metre. 

Example: Jason hopes to find a meter that can measure people's stupidity.

Metre: Metre is a metric unit that is used to measure distance.

Example: My school is just a few metres away from home.