A cartridge monitoring system for use in a cartridge-operated fire suppression system having an enclosure with an opening, sidewalls, an interior space, a cover, and a regulator assembly having a cartridge-receiving opening for receiving a cartridge and a regulator mount. The system includes a fixture positioned in the interior space in a fixed position relative to the regulator assembly; an elongate member having a rotation point fixed to a hinge member, a free end, and an arm portion between the free end and the rotation point, with the elongate member being rotatable about the axis of rotation between a first position in which the free end of the elongate member is within the interior space and a second position in which the free end is outside of the interior space.