1High Accuracy: This total station surveying prism comes with a 30mm constant, which reduces errors and ensures millimeter level accuracy. 2K9 Optical Glass: This survey mini prism features a K9 optical glass lens that is accurately ground to ensure total measurement accuracy. 3Excellent ABS Housing: The housing of this total station prism is made of excellent ABS material to withstand weather conditions as well as daily wear and tear. 4Wide Application: This mini prism has a wide range of applications and can be used for tunnel, subway, mine, highway inspection, etc. It is suitable for surveying instruments and is widely used in railroads, embankments, steep slopes and other industries. 5Compact And Portable: This mini prism system is small in size and light in weight, which makes it very convenient to carry around and use. 1 x Total Station Small Prism 1 x Lid 4 x Bathymetric Rods 1 x Storage Bag