Exemplary embodiments of force measurement systems are disclosed. In one embodiment, the force measurement system is implemented in a fishing rod system, to measure tension applied to the fishing line. Other exemplary embodiments include a fishing gaff used to gaff fish, and with a measurement system for providing an indication of the weight of a gaffed fish. Yet another embodiment is implemented in a fishing net, with a measurement system for providing an indicated of the weight of a netted fish or other netted object. A still further application for the force measurement system is in a shaft tension coupler.