It indicates the conversion factor between one pixel on the image and the length in millimeters on the measurement plane. The units are millimeters/pixels.
The procedure to snap an image of the calibration grid and train the measurement plane is as follows.
Click [SNAP].
Click the [Train] button of [Scale Conversion]. The reddish purple rectangle window (measurement area) is displayed.
Adjust the rectangle so that the grid is included in the frame. Since the calibration grid is generally placed so that the grid is displayed over the entire field of view, the reddish purple rectangle is set to the full screen mode.
Click [OK].The calibration grid is detected and the measurement plane is set.
When the measurement plane is set, the average scale on the set measurement plane is displayed in [Scale Conversion].
If there are command tools that had already been taught, a change in the measurement plane may change their measurement results. If the measurement plane is re-trained, these command tools may need to be trained again as necessary.