The MUYA GM130 Ultrasonic Thickness Gauge is a rechargeable, USB-charging thickness gauge for one-sided, non-destructive measurement of metal thickness up to roughly 300mm on steel. It offers a color backlit display, dual probe options for different material types, sound-velocity calibration for accuracy across different metals, and onboard storage for over a thousand readings. It's suited for inspectors checking wall thickness on tanks, pipes, and structural steel where corrosion loss needs to be tracked over time.