1. Speedometer: This is the most common way to measure speed, found in vehicles. It displays the instantaneous speed at which you are traveling.

2. Radar Gun: Used by law enforcement and traffic safety officials, radar guns emit radio waves that bounce off moving objects, calculating the speed based on the Doppler effect.

3. Stopwatch: Although not directly measuring speed, a stopwatch can help calculate speed by timing an object over a known distance. You would then divide the distance by the time to get the speed (speed = distance/time).