滴漏计时器
dī​lòu​jì​shí​qì

hourglass

滴漏计时器 (滴漏計時器) dī​lòu​jì​shí​qì
hourglass
a device for measuring time in which sand or liquid runs through a narrow neck from an upper to a lower glass vessel
water clock
an ancient timekeeping device that measures time by the regulated flow of water or other liquid, also known as a clepsydra

Sources
Definitions
CC-CEDICT