Info - IM-18 VTVM

[F. V. Encarnacion, Jr.]

Hello all: 

Found it almost impossible to 'peak & tweak' my SB-401 with a digital meter. Picked-up an IM-18 without a manual.  On the tip end of the black probe is a switch that flips 180 degrees on the axis of the probe, with one position marked 'DC'.  I can guess what it's for but would rather have it confirmed. Also, can anyone share a copy of a schematic? 

Thanks,

George AH6BV
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