ANTIQUE SIMPSON / MINNEAPOLIS-HONEYWELL MILLIVOLTMETER, MODEL W129A2X1

I have recently acquired a working, antique Simpson / Minneapolis-Honeywell millivoltmeter, model W129A2X1.
This unit is extremely old and I have had a difficult time tracking down any information pertaining to the unit.

On the inside of the case is a condensed chart with reference to thermocouple and powerpile readings -- I would presume this unit was designed to work with a boiler.

I am hoping someone here may have or know of somewhere/someone that I can obtain an operator's manual for this unit -- if there is such a thing.

I have recently contacted both Simpson Electric and Honeywell, but have yet to hear back from either regarding this interesting device.

As you can see from the attached photos, the casing is somewhat delapidated, but is still in a fairly sturdy condition. I took the liberty of dismantling the unit in order to replace the four lead wires as the originals were basically crumbling apart. I do not know whether or not the supplied aligator clips are the originals or not. On the bottom of each, they sport the following imprinting:

Mueller Elec. Co.
Cleveland Ohio U.S.A.
60 Series

Any information provided will be greatly appreciated.

Thanks in advance!

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Caine
caine@xxxxxxxxx