Burlington 331 DC Current Meter NOS - 26 Pieces - 40's?

Description

Up for sale, a group of 25 old stock (NOS) Burlington DC Meters.  Don't know the original application.  Came with a lot of old vacuum tubes from WWII.  The boxes are in terrible shape but meters look good (they are wrapped in cellophane inside the boxes).  There may be a dud here in the mix but the majority are presumed functional and physically decent.  All appear NOS.  Most are still in their crusty boxes, a few are loose.  Total diameter approx. 3 3/8 inch.  Actual barrel approx. 2 5/8 inch diameter.
US bidders/buyers only please.  This item will ship tracked and insured.