This unit is a year and a half old and in superb condition. It's been used about six times. The spectrograph comes with two gratings installed, 150 rulings per mm (resolution of 8 angstroms on an ST-7), and a 600 rulings per mm, high res. grating (resolution of 2.2 angstroms). Two slits are also included, 18 and 72 microns effective.
I'm selling because my projects are concentrating in areas other than spectroscopy, and funding is required. $3795 or reasonable offer. Buyer pays shipping. PayPal accepted with fee split if asking price is met.
A calibration unit is available separately, which contains a hydrogen and mercury discharge lamp and reaches the spectrograph via a fiber optic cable. $180.