Printed on flat black adhesive-backed paper with a peel-away backing, this 2" (50 mm) Safariland Adhesive Photo Evidence Scale (White) scale is printed with inch markings on one edge and metric markings along the opposite edge. For photos on horizontal surfaces, just lay the scale in the scene. For vertical surfaces such as bullet holes or blood spatter on walls, peel the backing off and adhere the ruler to the surface. This scale have non-permanent adhesive so they can be easily removed from evidence without damage. These scales are individually cut and packaged in quantities of 50.