This ultrasonic thickness gauge measures the wall thickness of steel and other dense materials like plastic, ceramic, and glass from 1mm up to 300mm without cutting into the part. It offers a selectable dual-frequency probe (5MHz/2.5MHz), stores up to 1,500 readings, and includes high/low alarm limits plus two calibration modes for accurate results across different materials. A color backlit display and USB charging round it out for use in pipeline, tank, and metal-fabrication inspection work.