Volume correction instrument and flow meter

The utility model provides a volume correction instrument and a flow meter, and relates to the technical field of gas flow metering. The volume correction instrument comprises a volume correction instrument body, a connecting piece and a camera, the volume correction instrument body comprises a first shell and a control mainboard arranged in the first shell; the first end of the connecting piece is fixedly connected with the first shell; the camera is fixedly installed on the connecting piece and electrically connected with the control main board, and the camera is used for shooting counting images of the counter. According to the volume correction instrument, the camera is installed on the volume correction instrument body through the connecting piece, a support for bearing the camera does not need to be independently arranged, the position relation between the camera and the volume correction instrument body does not need to be considered, and then the installation difficulty of the volume correction instru