The tachymeter on his watch helps him measure speed accurately.

他手表上的测速仪帮助他准确地测量速度。

The engineer adjusted the tachymeter to ensure precise readings.

工程师调整了测速仪以确保精确的读数。

He explained how to use the tachymeter during the training session.

他在培训期间解释了如何使用测速仪。

She used the tachymeter to calculate the speed of the moving vehicle.

她使用测速仪计算移动车辆的速度。

A tachymeter is essential for race car drivers to monitor their speed.

测速仪对于赛车手监控他们的速度至关重要。