The transparent plastic housing is filled with damping liquid. One grating is screen printed on the inside of the housing and one on the pendulum disc. The adjustment screw rotates the housing and its grating to any desired angle relative to the instrument body. The scale on the housing is graduated 120° - 0° -120°. Fits 10", 24", and 48" Dish Alignment Scales. Comes in a protective case.
and Level or any Angle. Measures elevation and declination in the back of the dish. Very robust and easy to read.
Alignment scales can be ordered in 250mm (10") and 600mm (24") and 1.2m (4 ft.) in magnetic and non-magnetic.
+/- 0.1 degrees