Features: 1FINE POLISHING: The optical glass lens is carefully polished, the surface of the uniform fine coating can ensure the quality of the lens 2BRASS ADAPTER: The single prism has a brass threaded adapter that can be attached to any 5/8in x 11 threaded rod or tripod 3PROTECTIVE HOUSING: The prism is equipped with aluminum alloy protective housing to ensure that the glass prism part is protected from wear and extend life 4APPLICABLE SCENARIO: Single tilt prism can be used for tunnel, subway, mine, highway, etc. Applicable to measuring instruments 5WIDE APPLICATION: Single prism is widely used in railway, dam, steep slope and other industries, useful and practical Item Type: Single Tilt Prism Material: k9 optical glass, ABS Effective Diameter: Approx. 64mm / 2.52in Constant: 0mm/-30mm Scope of Application: Tunnel, subway, mine, highway and other detection, suitable for other measuring instruments Usage: Widely used in subway, railway, tunnel, dam, steep slope and other industries 1 x Mapping Prism Head 1 x Lid 1 x Storage Bag