These precision fluidized sand baths provide critical temperature calibrations and heat treatment processing. The units are suitable for many applications, including thermal testing of sensitive components, such as semiconductor devices, wire products and delicate transducers. They also can be used as a constant temperature environment for chemical reactions. Due to their exceptional temperature uniformity and fast temperature immersions, its processing time is between two to three minutes per item for immersion in the bath, followed by quenching in cold fluid. It does not have surface tension effects of liquid baths, nor does it wet any objects that are immersed because the fluidized bed is a fine dry powder. The basic electrical insulating property of the aluminum oxide used in the baths is not affected by fluidization, making it possible to conduct electrical measurements on immersed objects, such as assembled printed circuit boards.