A new Jacob's staff using 3D printed brackets, a laser pointer, and an iOS app is described here. The staff offers improved accuracy of sighting, especially in situations where the rock exposure is not in the direction of dip, or where a lateral offset in a stratigraphic section is needed. Although the Jacob's staff will also work with a pocket transit or other inclinometer, the iOS app makes it easier to simultaneously maintain the correct dip angle and direction of the staff. The laser pointer substantially reduces error in sighting. The availability and low cost of 3D printing make this staff more accessible than similar apparatuses that require machined or welded metal parts. Field tests by students demonstrate greater accuracy than a traditional Jacob's staff combined with a transit.

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