What is the standard tool used for measuring large diameters of piping?

The standard tool used for measuring large diameters of piping is a gauging tape. This tool is particularly effective for measuring large circumferences or diameters because it is flexible and can easily wrap around curved surfaces. Gauging tape typically has markings that allow for precise measurement and is commonly used in various industries, including plumbing and construction, where large pipes are prevalent.

While calipers and micrometers are precise tools, they are generally used for measuring smaller dimensions and are less practical for large diameters due to their size limitations. A laser measuring device could also measure larger areas, but it may not be as versatile or as readily available in standard applications for piping measurements as gauging tape. Thus, gauging tape is the preferred choice for accurately measuring the diameters of large pipes.