Proceq Pundit Ultrasonic Pulse Velocity (UPV) Instruments provide an accurate and reliable means of assessing the quality of concrete. Transmission and receiving transducers send and receive a timed pulse of ultrasonic energy through the concrete to be tested. The time the signal takes to get through the concrete is used to determine its homogeneity and integrity. Pulse velocity measurements measure concrete uniformity, detect cracks and voids, track changes over time, and determine dynamic physical properties. Compressive strength can be estimated using the SONREB (SONic-REBound) method, the combined ultrasonic pulse velocity/rebound value from a Schmidt concrete test hammer. Measurement modes include crack depth, pulse velocity, surface velocity, data logging, and E-modulus. A range of additional transducers is available to allow more depth of penetration or better resolution.