Ultrasonic thickness gauge for non-destructive wall-thickness checks on steel, aluminum, copper, and various plastics, covering 0.05-7.9 in (1.5-200mm) with accuracy around +/-(0.5% + 0.1mm). Features a built-in automatic calibration routine, a clear LCD readout with selectable inch/mm units, and a low-battery warning. Ships complete with probe, couplant gel, hard carrying case, and batteries, backed by a one-year manufacturer warranty.