An Automatic Meter Reader (AMR) is a utility meter that takes automatic measurements. It is attached to your regular meter, rather than replacing it. An AMR takes readings itself. This means that neither you nor a professional from the supplier, needs to take the readings.
An Automatic Meter Reader sends you the data that it collects. You receive reports on the amount of water that you have used. These reports are more accurate than you would be able to take with a traditional meter. You can then submit these reports to your supplier, and save money by only submitting accurate meter readings. You can also draw conclusions about your water usage from the data you receive.