This is something I bought from Ebay for £30. It can output a voltage between 0.01uV to 9.9999v @30mA, It contains a precision zener diode which is used as a reference input to a FET chopper amplifier operating in feedback stabilized mode. The gain is determined by a set of precision metal film resistors which are selected by the 5 decade thumbwheel.
Looks like it was circa 1987.
The battery pack consists of 11 x 1.2 Volt AA Ni-Cads @ 700mA. They were assembled in 1998 and they starting to leak.
Because I didn't want to go to the trouble and expense to replace the batteries, so I just removed them from the unit instead.
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