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The 190 optical micrometer translates the line of sight laterally with an accuracy of ±0.0005" using an optical flat. The cast aluminum housing has a 1.655" opening to fit the telescope barrel of all Brunson optical tooling transits and levels.  Adapters are available which allow this micrometer to be used with with a variety of theodolites as well.  Any of four machined slots in the housing (located at the 12, 3, 6, and 9 o'clock positions) fit over a locating pin on Brunson telescope barrels for quick and accurate indexing of the micrometer to a horizontal or vertical position.  A precision glass window acts as a dust cover to protect the optical flat inside.  Refer to the table below for descriptions of the various models in this series.

Micrometer for Leica T-2 theodolite.  We have adapted our 190 for use with the Leica T-2 (see 190-WG in table below).  This micrometer has been modified with a larger bore to fit the Leica telescope barrel, and is finished with green polyurethane paint.  Note:  Except as noted in the table below, the 190 micrometers fit Brunson style instruments only.