The MIR space station carried a few of these manometers to measure the internal air pressure, an essential indicator for safety and leak detection. This is Serial Number 19, a flight spare from 1988.  
<p>It is still accurate today (1 ATM = 760mm Hg).
</p><p>Mir (Russian: Мир, meaning 'peace' or 'world') flew from 1986 to 2001, with a greater mass than any previous spacecraft. Mir was the first continuously inhabited long-term research station in orbit and held the record for the longest continuous human presence in space at 3,644 days, until it was surpassed by the ISS in 2010. Mir was occupied for a total of 12.5 years, having the capacity to support a resident crew of three.  When complete, the station consisted of seven pressurized modules and several unpressurized components. Mir was deorbited in March 2001 after funding was cut off. The cost of the Mir program is estimated at $4.2 billion. 
</p><p>It displays pressure from 0 to 960mm on an overlapping display.  The sub-dial with red numbers indicates a coarse measurement, so the reader knows which of the outer rim scales to use.
</p><p>Over the range of 10-800mm, the accuracy is +/- 2mm Hg.  It is designed for operation at temperatures from 0 to 40°С and relative air humidity from 20 to 85%, which contains oxygen up to 40%, helium up to 2%, carbon dioxide up to 2% by volume.  It can withstand acceleration of 2.7 g’s along all three axes and shocks of up to 30 g’s.  It has also been tested across a range of vibration frequencies to simulate launch and orbital insertion.
</p><p>The VK-316M “Mir” designation is a newer model from the VK-316 that flew on the earlier Salyut and Almaz space stations.  The latter VK-316M-67 and VK-316M-110 and other M-numbered units were not flown in space.
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An artifact in the Future Ventures’ 🚀 Space Collection.
Steve Jurvetson
CC BY 2.0
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