Vortek Instruments SonoPro® Portable Professional S34 Series clamp-on flowmeter incorporates high accuracy transit-time ultrasonic technology to deliver accurate and reliable flow metering. The innovative design includes matched precision transducers and signal processing circuitry to accurately measure the flow of most liquids over a wide range of velocities. Clamp-on transducers create no wear, zero pressure loss, and do not require process interruptions to install them since they are attached to the outside of the pipe.