Abstract: A direct reading prism pole has a tubular housing having an open top, a flange at the open top, a conical bottom portion for wedging the tubular housing into ground soil, a height-adjusting rod partially inserted into the tubular housing by a friction fit, a lip positioned at the top of height-adjustable rod, a laser sensor mounted to the outer surface of the tubular housing for emitting a laser toward the lip to take height measurements of the distance between the laser sensor and the lip, an electronic control unit for receiving the height measurements and providing height reference data, an electronic display for displaying the height reference data, an audio device for emitting an alarm indicating movement of the height-adjusting rod with respect to the tubular housing, and an output device for sending the height reference data to a data collection device.

Abstract: A measuring device for obtaining inlet invert measurements, pipe invert measurements, and pipe diameter measurements includes an invert measuring rod having a plurality of rod segments, each a threaded bore at a first end and an axially extending threaded stud at a second end, a foot assembly comprising a guide rod removably connected to and extending perpendicularly from the bottom of the lower segment of the continuous rod, when connected having a free end opposite the connecting with the invert measuring rod with a bottom conical foot connected to and extending downwardly from the free end of the guide rod and parallel to the invert measuring rod, the bottom conical foot having an axial length the same as axial length of the conical rod tip, and extending from the free end of the guide rod parallel to the invert measuring rod and a diameter measuring sleeve, having a tubular portion positionable concentrically about the invert measuring rod and having an inner diameter just greater than the outer diameter