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.
The ChrisNik Pipe Mic II is made for 25' SVR and USL rods. This pipe sizing tool 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 ft 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 ChrisNik Pipe Mic II. If you have limited clearance under the rod to measure an invert, remove the snap pin and set the arm to "3' ARM w/1' VERT. 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 "3' ARM w/ 1' VERT. OFFSET" hole. Remember to add the extra foot to your measurement.
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.
Patent Pending
Example:
4" Pipe = 0.00 movement
6" Pipe = 0.17
8" Pipe = 0.33
10" Pipe = 0.50
12" Pipe = 0.67
