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Adjustable Slits with Micrometers Spex Industries 1451N

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Product Description

Manufacturer: Spex

Model: 1451N

Condition: Used. Comes in non-original packaging. These were all pulled from a decommissioned Spex spectrometer and all but one have visible corrosion, mostly on the micrometer dials.  One has a bunch of oil from us trying to make the adjustable slit/shutter work at all.   Sorry, we did not find any model numbers on the rectangular units. We did not find any specifications on any of these online.  A couple of photos show mounting bolts; these have since been discarded (they were quite rusty!) The photos show the exact item(s) the buyer will receive.

Notes: All of these adjust but only one is really fully working. One of the round units has its adjustable shutter/orifice plate very hard to move; we oiled it but it still needs to be persuaded with a mallet tap to move.  The other round unit doesn't close 100% shut.  One of the rectangular ones sticks a bit instead of moving smoothly.  All of these do open to about 3mm and the rectangular slits open much wider than that when the toggle is moved to the wide-open position.  No other testing was done. No manuals, cords/cables, or additional items are included if not listed or shown.


  • (4) Micrometer-Adjustable Slits
  • (2) Opaque plastic plates to cover the 1451N slits


  • Manufacturer: Spex
  • Adjustable slits with micrometer adjustments
  • (2) Spex 1451N have selectable-width slits
  • (2) unbranded have lenses of unknown power
  • All open to about 3mm wide with micrometer adjustment
  • All seem to close or nearly close all the way

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