A gas meter is a device used to measure the amount of gas consumed by a residential or commercial building. It tracks the flow of gas in cubic feet or cubic meters, allowing utility companies to bill customers accurately based on their usage. Gas meters are typically installed outside buildings and are connected to the gas supply line. There are two main types of gas meters: mechanical and digital. Mechanical meters use a rotating dial to measure gas flow, while digital meters provide a digital readout for easier reading. Both types help ensure safe and efficient gas usage in homes and businesses.