China Naming Network - Eight-character Q&A - What does it mean that the last digit of a four-digit water meter is a wheel from 0 to 9?
What does it mean that the last digit of a four-digit water meter is a wheel from 0 to 9?
This paper introduces the roller display in water meter.
The four-digit water meter mentioned in this sentence means that the reading of the water meter is composed of four numbers. The last digit is displayed by a rotatable wheel ranging from 0 to 9. When the water flows through the water meter, the wheel will rotate according to the change of the water flow, thus changing the display of the last digit.