Feature:1. [Working Process] Our single tilt prism is used together with total station for land survey and has a wide range of uses.2. [K9 Optical Glass] Our single tilt prism is made of excellent K9 optical glass and with excellent workmanship.3. [Reflecting Ability Enhancing] The optical glass accurate detection enhances the reflection ability of this total station prism, good texture.4. [Clear and Bright] Optical glass can make this total station prism detecting more clear and bright, more accurate measurement.5. [Robust ABS Housing] This surveying single tilt prism is with robust ABS housing and ensure that the glass prism is protected from wear.Specification:Item Type: Total Station Large PrismMaterial: K9 Optical Glass, ABSEffective Diameter: Approx. 64mm / 2.5inConstant: 0mm/-30mmApplication: Tunnel, Mine, Highway And Other Inspection, Applicable For Trimble And For Topcon And Other Measuring Instruments.Use: Widely Used In Railroad, Tunnel, Dam, Steep Slope And Many Other Industries..Package List:1 x Total Station Large Prism1 x Cover1 x Storage Bag