Arc Caliper Found Edges and Caliper If the display in the Pair Settings window is blank, or the edges are not properly placed, close the window and verify the following: l The tool was executed after positioning the tool. l The tool was executed at least once before opening the Pair Settings window. l The Location parameters are correct. l The Y-axis of the tool is parallel to the edges you want to detect. Constraints are set with the Edge Pair Collection Editor window. From the Object editor win- dow, select Configuration > Properties >Pairs > : ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 360