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An acoustic gas meter is a device used to measure the rate of gas flow. It operates by comparing the frequency shifts of two identical signals. One signal is sent upstream, and the other is sent downstream. After these signals are reflected, their frequency shifts are compared to determine the gas flow rate. This is one of several types of gas meters, which also include displacement, velocity, head, thermal, and tracer meters. Gas meters, in general, are instruments for recording the quantity of gas passing through a specific outlet.12

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