Which saves water, an old water meter or a new water meter

Old water meter. The old water meter is the use of purely mechanical mechanism to measure water flow, water flow from the gear through the gear will have a certain impact on the gear, the gear is attached to a rubber sheet, play a role in buffering and reducing the impact of the gear, the new water meter is electronic, using photoelectricity to measure the flow of water, water flow impact on the gear, the gear drives the word wheel counting, there is no buffer, the old water meter than the new water table water saving.