WWII era wood Lewis Engineering Tester Thermometer 81TT9 aviation airplane AS IS

Description

I know nothing about this item and cannot test it so it is being sold "as is".  It may work or it may just be good for parts or displaying.  (I imagine it is just a collector piece by now since it is so old.)
Up for bids is an aviation related WWII era wood Lewis Engineering Tester Thermometer 81TT9.  See pics for markings.  It appears to be in decent shape--is pretty dirty and shows wear.  It measures 17" by 11" by 4".  Both ends open up--one used to hold the batteries and there is some wiring and equipment in the other end--see pics.  One of the small rubber pieces that goes on the bottom for leveling is missing.
NO RESERVE. View my EXCELLENT and EXTENSIVE Ebay feedback record and bid with confidence.
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Thanks and goo
d luck.