Patent Pending and Pronounced “Pipe Mike”, 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. Grade rod is sold separately.
Made for Crain 25′ SVR and USL Grade Rods (grade rod NOT included), the Pipe-Mic II is 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 1 foot 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 1 foot extension (extension is sold separately).
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