Transparent sticker (12x19 mm) with a 5mm ruler at the top edge of the label. The label is ideal for calibration of individual images or lenses together with the X-Loupe Image Management software. The Calibration Label is attached to the object before taking an image of the object. The 5 mm ruler then becomes a part of the image and can be used for calibration. The label is easy to remove from the object again.