Prism poles can be quite useful in surveying jobs. These instruments help surveyors measure elevations in the ground, as well as grades. Used in conjunction with laser levels, transit levels, and automatic levels, prism poles can help improve the accuracy of measurements. Of course, not all prism poles are made equal. Some, like the ones made by Sokkia, are high-quality and offer more bang for your buck.
Sokkia has cultivated a reputation as a leading manufacturer of surveying tools and equipment. Prism poles and other products by this brand are available here on Engineer Warehouse.