How much water does it take to turn the small red 0.0001 needle in one circle on the water meter

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How to check how many tons of water have been used on the water meter? What are the numbers of water meters in the following figure?

2. What is the number of the circled position on the water meter in the picture, and can we know the water meter number through this number ..

3. May I ask if the meter displays m as a ton?

4. How much water does the small red 0.0001 needle in the meter use to turn one circle?

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