Voltcraft digital multimeters vc 830850870880 voltcraft vc850 the voltcraft vc 850 digital multimeter is a sturdy reliable practical piece of equipment that is safe for the user this professional multimeter has a patented casing construction that allows it to be opened for changing the battery and the fuses only when the device has been disconnected from all measuring leads at input voltages of gt 30v a warning symbol appears in the display the unique safety concept is rounded off