Digital Erick Miracle Point model 900 Magnetic base protractors also known as centering head, or pipe centering tool. More precise then other centering head tools Digital display resolution 0.1 degree / centering accuracy = +/- 0.5 degree 4x90 degree gives immediate reading of angles for 360-degree radius. Display .10 degree or % pitch per foot angle Absolute or relative measurement The V base exerts a powerful magnetic pull to most any shape/form. The V base is precision milled and the center pin will show the middle point at the angle being indicated Punch the center point with the Centering Head Works on all sizes of pipe or along with pipe-fitter type layout tools it's the fastest, and one of the most accurate ways to mark the center of round, square, hex, most any shape that fits into the v leg great for metal fabrication, pluming, welding, set up, drills, mills, lathes, benders and general leveling needs · extra features include o Calibration certificate included with new or re-serviced units Guaranteed +/- .5 degree o All instruments have been calibrated against standards traceable to NIST standards o certificate included with new or re serviced units Guaranteed +/- .5 degree o 1 year service warrantee includes no charge labor plus any replacement parts. o Made in U.S.A. comes with heavy duty steel carrying case