Feature 1SPECIFICATIONS: Circular reflector prism, 3 heads design, the effective diameter is 64mm, the measuring prism offset is 0/30mm. 2OPTICAL GLASS LENS: The prism lens is made of excellent optical glass with fine polishing, and the delicate coating can ensure long term use. 3STABLE STAND: The surveying prism is equipped with a stable stand, convenient to install the prism on the total station for use. 4ABS HOUSING: The prism housing is made of excellent ABS, which is impact resistant, aging resistant, and has a long service life. 5WIDE APPLICATION: The 3 head prism is widely used for tunnel, railway, dams, mines, highway detection, which is compact and practical.SpecificationItem Type: PrismMaterial: Optical Glass, ABSEffective Diameter: Approx. 64mm / 2.5inConstant: 0mm/-30mmUse: Widely used in subway, railway, tunnel, dam, steep slope, mine, highway, and other detection. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Prism3 x Covers1 x Storage Bag