stopwatch

Instrument that precisely measures time in minutes, seconds and fractions of seconds.

reset button

Button that is pushed to return the stopwatch’s hands to 0.

minute hand

Metal needle that indicates minutes on a dial graduated from 0 to 30 minutes.

second hand

Metal needle that indicates the 60 equal divisions (seconds) of a minute by moving in small jumps.

1/10 second hand

Metal needle that indicates the 10 equal divisions of a second on the dial.

ring

Round part for holding or hanging the stopwatch.

case

Outer covering that encloses and protects the device’s mechanism.

stop button

Knob that is pushed to stop the hands, which then display the precise amount of elapsed time.

start button

Knob that is pushed to start the stopwatch and measure the duration of a phenomenon or event.