[Milsurplus] Military Ohmmeter identity?

[Nick England]

http://www.navy-radio.com/test/ohmmeter.jpg

Not a multimeter, only an ohmmeter. Uses 2 ea. BA-30 batteries.
0-500 ohm scale, X10, X100, X1000

Thanks for any info, ID, etc.
Nick England K4NYW
www.navy-radio.com
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