Z E R O - C E N T E R   MICRO-AMPERE  METER   SIEMENS & HALSKE   (1960)
***********************************************************************
Dimension:  ( W-D-H )  110 mm x 145 mm x 70 mm  /  4_1/4" x 5_3/4" x 2"

Class 1    +/- 30 Scale  =  +/- 10.5 μA    ( 1 Mark = 0.35 μA  / 60 Ω )

The bakelite housing is the same as the  »MULTIZET«  instruments  have. 
It explains the "Big Circle" on top.  Remarkable is the ZERO-MAGNIFIER.

Because of its EXTREME SENSITIVITY, it is recommended to  SHORT-CUT the
input-plugs when it is not in use  (= "Induction-Damping" when moved !)

R E M A R K S   T O   R E S T O R A T I O N :
-----------------------------------------------------------------------
Also this special μA  Meter came with rattling glass and crumbled black
glass-glue pieces on the scale.  After breaking the seal, it was a mass
to remove the sticky black glue from the edges of the bottom-plate  and
housing. After disassembling, removing all dirt, a frame of black card-
board was made to seal the cleaned glass ( holded inside with springs )

impressum:
***********************************************************************
© C.HAMANN         http://public.BHT-Berlin.de/hamann          04/18/12