TFXL Transit Time Flowmeter clamps directly to the pipe. It is available for 1/2 in., 3/4 in., 1 in., 1-1/4 in., 1-1/2 in., and 2 in. diameter pipe or tubing. Does not require anything inside the pipe at all. Displays rate and totalization. Outputs are 4-20mA and simulated turbine meter frequency. Requires a computer to configure (including reset total).