Feature: 1. +28.1mm Constant: This 360° prism has a constant of +28.1mm, which indicates the offset or correction value to be applied during the measurement. It also has an effective diameter of 25.4mm, which determines the size of the measurement area. These specifications make the prism suitable for a variety of applications that require accurate measurements. 2. Reflective Coating: This total station reflector prism features a reflective coating that ensures a higher percentage of the measurement beam is captured and redirected to minimize loss and maximize accuracy. 3. Sturdy And Rugged: This 360 degree mini prism is made of excellent quality K9 glass, known for its high light transmission properties, which means it allows a high percentage of the measurement beam to pass through, resulting in clearer, more accurate measurements. 4. Good Performance: This 360° total station prism design has 6 separate prisms joined together to allow the measurement beam to reflect from any angle. This design feature provides flexibility and convenience during the measurement process as it allows reflection from all directions without the need to reposition the prisms. 5. Wide Application: This 360 degree reflective prism has a wide range of applications and can be used in inspection scenarios such as tunnels, railroads, dams, mines, highways, steep slopes, etc. for efficient and reliable measurements. Specification: Item Type: 360° Prism Material: K9 Glass, ABS Constant: +28.1mm Deviation: 3 Arc Seconds Effective Diameter: Approx. 25.4mm / 1in Application: Tunnel, Subway, Mine, Highway and other Inspection, Applicable to for Sokkia, for Trimble and Other Measuring Instruments. Use: Widely used in subway, railroad, tunnel, dam, steep slope and many other industries.. Package List: 1 x Total Station Prism 1 x Strap 1 x Carry Bag