Radio Shack 22-218 - Manual (Page 24)

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Note: In AC wiring circuits, the ground lead is usually a bare,
green, or white lead and the hot wire is usually red, black, or
blue. In DC wiring circuits, the ground lead is usually a black
lead; the hot wire is usually red.
WARNING: NEVER CLAMP ONTO A HOT WIRE. IF YOU
CLAMP TO A HOT WIRE AND TOUCH THE OTHER
PROBE, YOU COULD RECEIVE AN ELECTRIC SHOCK.
22-218.fm Page 24 Friday, August 6, 1999 11:44 AM