B&K Precision 830C - Manual - Manual (Page 14)

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protects the meter for better durability. Additionally,
the top rubber visor molding above the screen is
designed to prevent scratches on the display when
the meter is positioned upside down.
A single 9V battery or the included DC 12V power
adaptor (included with model 830C only) can be used
to power the meter. This gives user flexibility for
portable or bench-top use.