That's a "Tong", the clamp end is placed around the single active wire on an AC circuit to measure the current (Amp's).
With the dial set in the Vdc section on 20 you can measure DC voltages to one decimal place ie 12.5 volts DC using the probes.
Nice little find you have there.
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 SOLD 06 Limited G/C QuadraDrive II Lovells 2"Lift +30 rims 265/70/17 Imported Saguaro Bar Stedi
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