Whether galvanized pipe can use external ultrasonic flowmeter?

The thickness of galvanizing is different from the method of galvanizing (electroplating and hot galvanizing are the most common, as well as mechanical galvanizing and cold galvanizing), resulting in different thickness. Generally, if the pipe is galvanized externally, it only needs to polish off the outer galvanized layer. If both inside and outside are galvanized, depending on the actual situation, it may not be able to measure.