We measure power using a wattmeter.

When I looked at the hygrometer, I realized that the humidity in the room was too high.

He repelled the enemy using the empty fort strategy.

He passed the exam using a crafty trick.

I use a heart rate monitor during my daily exercise.

I use a pulse rate monitor to check my heart rate every day.

I measured yesterday's rainfall using a pluviometer.

We installed a new flowmeter in the factory.

The altimeter on my airplane broke.

My ear hurts because it's clogged with earwax.