An apparatus for ensuring strain gauge accuracy including a handle assembly including a controller, an adapter assembly including a tubular housing having a proximal end portion configured to couple to the handle assembly and a distal end portion, a load sensing assembly configured to measure a load exerted on the tubular housing, and a signal processing circuit electrically coupled to the load sensing assembly, a memory coupled to the signal processing circuit, and a calibration assembly including a biasing member having a known spring rate stored as a force value in the memory, the calibration assembly configured to couple to the distal end portion of the adapter assembly. The signal processing circuit is configured to calibrate the adapter assembly with the calibration assembly attached thereto by calculating a correction factor based on a comparison a force of the spring member measured by the load sensing assembly to the force value.