HIGH-QUALITY DESIGN. Made using a strong ferrite magnet, the 47mm x 47mm Reflective Prism Sheet can be easily attached to any metal structure without causing damage. Please note that it might not adhere to textured or oily surfaces.FULL ROTATION. Integrated metal and PVC material washers provide a smooth and stable rotating movement at any angle. As such, the reflective surface boasts a 360-degree rotation capability to allow measurement from any direction.ACCURATE MEASUREMENTS. Featuring a measuring range of up to 984 feet (300m) and a constant of 0mm, you can measure the datum point or correcting points accurately with the AdirPro Monitoring Prism Sheet with Magnetic Target.EASY TO USE. An essential tool in assuring proper long-range measurements, this reflective target is easy to spot from its position and adheres to any magnetic surface which makes it easy to use.GREAT ACCESSORY. Great for back sights, check shots, elevation references and monitoring situations, this Reflective Prism Sheet will save crew time, provide better data and keep you out of danger.length0.8 x 2.5 x 4 inchesWeight13.8 pounds