1. Fabry Perot Etalon mounted on spectrometer

Scale: 7" diameter (Brass)
Base: Cast iron with leveling screw
All moving parts made of Brass for accuracy
Collimator with adjustable slit
Horizontal axis alignment for collimator: Yes
Horizontal axis alignment for telescope: Yes
Center Table: Height adjustable with provision for Prism and grating holder
Telescope with user changeable cross wire and eyepiece
Etalon diameter: 25 mm
Spacing: 2 mm
Pine hole camera: Yes (removable)

2. Sodium vapourlamp set

Lamp: Philips / Thorne 35 W
Lamp House: Single lamp type with fixed slit openings
Transformer: 35 W, Instant ON type
Rated Input: 220 V/50 Hz or 110 V/60 Hz