Voltcraft digital multimeters vc 830850870880 voltcraft vc830 the voltcraft vc 830 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 the integrated tldreg function test lead detection warns if the measurement lines are connected incorrectly