Auto Optical Level Optical LevelThis Instrument Is Mainly Suitable For High Precision Survey Of Engineering Including Construction Project, Mines, Road, Bridge, Etc.It Possesses Convenient Operation, Clear Image, Water Proof Facility, Type X Air Or Magnetic Damping And Compensation Mechanism, And Precision Of Compensator.It Is Speedy And Reliable As Well.AL8 SEIRIES AUTOMATIC LEVEL ModelAL8-22AL8 ...