The Sonic-Pro S4 inline ultrasonic flowmeter measures flow using the Transit Time method. The technology has no moving parts and no internal liners. Pipe fittings facilitate installation of the meter, and a special low power mode permits operation with battery for limited functions. Download data logging files directly to a flash drive via USB. The flowmeter is NSF 61 certified and the housing is NEMA 4X/IP 66 for wash-down.