How to copy the water meter? How to read a degree?

In the actual meter reading, the reading is as follows: the black pointer near the red pointer is the unit ton, and the decimal number is 10. Starting with the biggest black needle, the lower position determines the upper position. The low bit is close to zero, but the high bit does not carry (that is, to prevent the pointer from making mistakes, the pointer is not rigid and fixed, and overloading and long-term operation will inevitably make mistakes). If the number of digits below 10000 is 8,500, the number of digits below 90 and the number below 8 is 3, it should be read as 84883. In the above example, five thousandths decide eight ten thousandths. The pointer error will not exceed half. The 9 of 1000 bit determines that the 5 of1000 bit should be 4 instead of 5. And so on. It is troublesome to say, but it is easy to understand.