Measure distances along lines and geometric shapes The Measurements license includes a pylon vTool for measuring distances between edges along a single line. Simply grab a live image or load a model image from file and draw a measurement rectangle including the measurement line with your mouse on the image. If used in combination with the calibration vTool, the vTools only need to be connected, and all measured distances are then returned in the calibrated metric. The Pro Version extends this feature with Measurement along geometric shapes such as rectangles and circles. Pylon vTools are part of Basler's pylon Software Suite.