Arc Edge Locator After the Arc Edge Locator detects potential edges, it determines which edge pairs are valid by applying the constraints that are configured for each edge pair. The Arc Edge Locator determines the position of one or more edges, but it does not measure the length of lines detected in the region of interest. To extrapolate and measure a line on an object, use the Edge Finder tool. To create an Arc Edge Locator tool, right-click in the Tree structure, then select: New > Vision > Tool > Arc Edge Locator ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 372