Package contains Digital Inclinometer and Companion Unit. Also comes with case and connecting cable. Two-inclinometer technique and procedure is well defined in the 5th Edition of AMA Guides. Acumar Dual Inclinometer contains modern features that simplify measurements and increase objectivity. Acumar Dual Inclinometers can simultaneously capture both angles by the press of a single button. It allows up to six pairs of data for viewing and recording to greatly speed up data capture and analysis.