The AdirPro 1.5-Inch Monitoring Mini Prism is perfect for all robotic works and surveying jobs. Outlined with an offset of 27 mm, this mini prism is built with water resistant structure perfect for all demanding and tough job sites. With an adjustable prism direction in X and Y axes, it is also available in 1-inch size with 17mm offset so surveyors can select the best match for monitoring distance. In addition, this AdirPro monitoring prism package comes with an anchor bolt.