A Digital Gas Flow Totaliser is an instrument used to measure and display the accumulated or totalized volume of gas that has passed through a pipeline or system. It utilizes various flow measurement technologies such as turbine flow, thermal mass flow, ultrasonic flow, or differential pressure, depending on the specific requirements and the type of gas being measured. They can be powered by various means, including AC power, DC power, or battery power for portable applications. Digital Gas Flow Totaliser is an essential tool in industries where accurate measurement and recording of total gas consumption are crucial, especially for billing, compliance, and process control purposes.