Abstract: A base target apparatus for aligning a length of pipe (100) along the longitudinal axis of a pipe string wherein the target apparatus (10) includes a base unit (11) containing a target unit (13) and having one tapered end (15) which is dimensioned to be received in the bell end (101) of the pipe whereas, the other end (15') of the base unit (11) is provided with an anchor unit (12) which is dimensioned to be frictionally engaged in the spigot end (102) of the length of pipe (100).

Abstract: A combined centerline target and grade checker apparatus (10) for use in aligning the centerline of a pipe segment (200) and checking the grade of a pipe trench (1), wherein the apparatus (10) comprises a target unit (12) and a support unit (13) which are moveably and operatively associated with a framework unit (11) such that the apparatus (10) can be used in conjuction with a laser beam generating device (100) to function both as a grade checking device and a centerline target device.

Abstract: A method and apparatus (10) employed to give the operator of excavating equipment a quick and accurate visual indication of the amount of excavation reguired to attain a desired grade level; wherein, the apparatus (10) comprises: a laser unit (11); a representative pipe section (12); a centerline target unit (13); and, a grade checker unit (15), whereby the coincidence of a laser beam (50) projected from the laser unit (11) and selected portions of a stationary target element (16) and an adjustable target element (27) on the centerline target unit (13) and the grade checker unit (15) respectively determines the desired grade depth.