This is a Oriel 77250 Monochromator.
- 2 Adjustable slit attachments included with slider for variable height.
input and output slit sizes marked 3.16, 1.56, 1.24, .760, .600, .280, .120, 0.05
grating is marked 206
- .54 in Mounting Post.
needs timing belt
BMI Surplus, Inc. has a huge inventory of used, new, pre-owned and recycled Monochromators for sale.

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