The easy-to-use, stand-alone digital ultrasonic pipe wall thickness gauge is an indispensable tool in accurate clamp-on ultrasonic flow measurement. Since even the smallest miscalculation of the pipe wall thickness can have a major impact on a clamp-on flowmeter's accuracy, the pipe thickness gauge has to be extremely precise. This is why the standard probe operates at a 5 MHz frequency enabling it to measure even the smallest pipe thickness. Although the thickness gauge was originally designed to increase the accuracy of clamp-on flowmeters, it can be used to measure the thickness of any pipe wall.