Data on File — (The force exerted with the 5C1 transducer was an average of 4.5N or 1.01 pound-force (pounds of force). The force exerted with the DAX transducer was an average of 1.3N or 0.3 pound-force (pound of force).
Scholl, C., and Salisbury, H. (2017). Barriers to Performing Ergonomic Scanning Techniques for Sonographers. J. Diagnostic Med. Sonogr. 33, 406–411.