Measurements are more accurate because you are measuring with a vertically plumb rod. New round foot design slices through material at bottom of pipe and insures accurate invert and pipe diameter measurement. By pulling a pin you can go from zero to 1 foot vertical offset for clearance under rod.
Made for 25' SVR and USL rods. Made of lightweight (two pounds) non rusting aircraft aluminum. No tools needed to attach to rod. Slides on and off rod in seconds. 24" measuring arm can be extended to 36" by adding 1ft extension (extension sold separately).
To use, you can direct read the depth of the invert when the pin is set at "zero offset" on the Pipe Mic. If you need clearance under rod to measure an invert move the pin to "1' vertical offset hole" If you need clearance under rod and a pipe that is hard to reach you can add a 3 foot extension (click here to purchase). Move pin to "1' vertical offset w/3' extension" hole
To size a pipe, the foot is 0.33 or 4". Take the reading from the rim, pull up and take reading plus 0.33 and that is your pipe size.
4" Pipe = 0.00 movement
6" Pipe = 0.17
8" Pipe = 0.33
10" Pipe = 0.50
12" Pipe = 0.67
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