1,Multifunctional: This elbow diagonal eyepiece allows for accurate measurements in steep areas, and the eyepiece can effectively measure any target at a distance from the instrument, as well as points and angles in any direction. 2,Excellent ABS Material: This elbow diagonal eyepiece is crafted with excellent quality ABS material to provide long term strength and continued use, durable enough to withstand harsh job site conditions. 3,Compact And Portable: This elbow diagonal eyepiece is small in size and light in weight, which is very convenient to carry and use. 4,Wide Application: This elbow diagonal eyepiece can be widely used in many industries such as subway, railroad, tunnel, dam, steep slope and so on. 5,Good Compatibility: This elbow diagonal eyepiece has good compatibility and can be used in for Southern, for Kolida, for Sanding electronic theodolite.