Abstract: A (e.g., dissolution) testing system has one or more stationary reader units and one or more corresponding rotatable shaft assemblies. Each reader unit has reader circuitry electrically connected to a reader antenna. Each shaft assembly has shaft circuitry electrically connected to a temperature sensor and a shaft antenna. The reader circuitry controls the reader antenna to wirelessly convey electrical energy to the shaft circuitry via the shaft antenna. The shaft circuitry controls the shaft antenna based on temperature measurements from the temperature sensor to wirelessly convey corresponding temperature information to the reader circuitry via the reader antenna. The testing system may employ a Near-Field Communication protocol to convey both the electrical energy and the temperature information.