A fiber property testing system for classing fiber samples based on properties of the fiber samples. Loading means receive unloaded cassettes and load the fiber samples into the unloaded cassettes to produce loaded cassettes. Testing means receive the loaded cassettes, remove fiber subsamples from the loaded cassettes, and perform property testing measurements on the fiber samples and the fiber subsamples. Unloading means unload the tested fiber samples from the loaded cassettes to produce the unloaded cassettes. Conveyance means receive the loaded cassettes from the loading means and deliver the loaded cassettes to the testing means, and receive the unloaded cassettes from the unloading means and deliver the unloaded cassettes to the loading means. Control means control delivery and receipt of the loaded cassettes and the unloaded cassettes, receive and correlate information generated during the property testing measurements, and class the fiber samples based on the information.