The WARP portable is a mobile, radar-based hand-held gauge for selective wall thickness measurement, specially designed for medium and large pipe extrusion as well as for sheets. The application possibilities are very flexible, whether as a quick centering aid in the start-up process, for final production control or as a stock control device. Not only wall thicknesses at pipe ends can be measured, but also the progression inside a pipe section or a sheet. The measurement itself is performed at the push of a button. The last 500 measured values including the measuring angle on the pipe as well as the time stamp are stored.