A surgical object and fluid monitoring system, comprising: a support ring for securely supporting a container with at least one port opening of the container being disposed for receiving surgical objects placed into the container through the at least one port opening with the aid of gravity; a hollow spine structure vertically oriented and comprising a channel with channel walls along the length of the hollow spine structure; a rod movably disposed in the channel within the hollow spine structure, the rod moveable along the channel; a weight force sensing device mechanically coupled to the rod, the support ring mechanically coupled to the rod, and the rod being in a moving arrangement that transfers weight force from the support ring to the weight force sensing device; a flexure mechanically coupled with the rod and the hollow spine structure, the flexure acting as a tensioning spring force element on the rod maintaining the rod vertically aligned in the channel with a gap separating the length of the rod from the channel walls, the gap allowing the rod to move vertically without friction from contact with the channel walls while the rod in the channel is protected from impact by the channel walls; and wherein said system comprises a processor communicatively coupled with the weight force sensing device, wherein the processor, responsive to executing computer instructions, performs operations comprising: detecting, with one or more RFID communication circuitries (305, 307) communicatively coupled with the processor, placement of a surgical object including at least one RFID device into the container through one of the at least one port opening with the aid of gravity by the one or more RFID communication circuitries (305, 307) interrogating the at least one RFID device of the surgical object being placed into the container; determining an incremental weight of the contents of the container from the surgical object placed into the container through the port opening, based at least on an information signal received from the weight force sensing device indicating a change in weight force sensed by the weight force sensing device contemporaneous with the placement of the surgical object into the container through the at least one port opening with the aid of gravity. a support ring for securely supporting a container with at least one port opening of the container being disposed for receiving surgical objects placed into the container through the at least one port opening with the aid of gravity; a hollow spine structure vertically oriented and comprising a channel with channel walls along the length of the hollow spine structure; a rod movably disposed in the channel within the hollow spine structure, the rod moveable along the channel; a weight force sensing device mechanically coupled to the rod, the support ring mechanically coupled to the rod, and the rod being in a moving arrangement that transfers weight force from the support ring to the weight force sensing device; a flexure mechanically coupled with the rod and the hollow spine structure, the flexure acting as a tensioning spring force element on the rod maintaining the rod vertically aligned in the channel with a gap separating the length of the rod from the channel walls, the gap allowing the rod to move vertically without friction from contact with the channel walls while the rod in the channel is protected from impact by the channel walls; and detecting, with one or more RFID communication circuitries (305, 307) communicatively coupled with the processor, placement of a surgical object including at least one RFID device into the container through one of the at least one port opening with the aid of gravity by the one or more RFID communication circuitries (305, 307) interrogating the at least one RFID device of the surgical object being placed into the container; determining an incremental weight of the contents of the container from the surgical object placed into the container through the port opening, based at least on an information signal received from the weight force sensing device indicating a change in weight force sensed by the weight force sensing device contemporaneous with the placement of the surgical object into the container through the at least one port opening with the aid of gravity.