Abstract: A tool for simultaneously measuring the gap and flushness between two adjacent panels includes a pair of probes for engaging the panel edges and adjacent surfaces, one probe being slideable in one direction to adjust to the panel gap and the other probe being slideable at right angles to the other to adjust to different flushness values. The probes are equipped with electrical position transducers to give readings on gap and flushness. The probes can be slid along a gap to obtain a rapid succession of data points. One embodiment has rollers for probe contact surfaces to aid in sliding the tool along the panels.