Rheometers; rotational rheometers; laboratory apparatus and instruments for measuring viscosity and viscoelasticity; laboratory apparatus and instruments for measuring material stresses; replacement parts and fittings for rheometers; laboratory instruments, namely, autosamplers and automated sample processing apparatus and carousels; accessories for analytical apparatus and instruments for laboratory use for temperature and environmental control, namely, peltier plate systems in the nature of electrical heating and cooling plates, plate pressure cells in the nature of vessels that can withstand high internal pressures, environmental test chambers, namely, temperature simulation equipment, refrigerated cooling systems, namely, analytical instrument accessories for controlling sample temperature, electrically heated cylinders in the nature of test chambers, forced convection oven accessories, namely, analytical instrument accessories for controlling sample temperature; accessories for analytical apparatus and instruments for laboratory use, namely sensors for sensing the mechanical and material properties of samples, temperature, pressure, relative humidity, motion, distances, force, torque, viscosity, elasticity, material strain, tension, deflection, compression; accessories for analytical apparatus and instruments for laboratory use, namely interfacial rheology accessories, namely, accessories for analyzing viscoelasticity, tribo-rheometry accessories, namely, accessories for analyzing friction, magneto-rheology accessories, namely, accessories for analyzing properties of materials subject to magnetic fields, electro-rheology accessories, namely, accessories for analyzing properties of materials subject to electric currents, UV curing accessories, namely, accessories for analyzing properties of materials subject to ultraviolet radiation, dieletric measurement accessories, namely, accessories for analyzing properties of materials subject to an oscillating electrical field, diaelectric thermal analysis accessories, namely, accessories for analyzing properties of materials subject to controlled temperatures and an oscillating electrical field, dynamic mechanical analysis accessories, namely, accessories for analyzing material properties of solid materials, orthogonal superposition accessories, namely, accessories for analyzing nonlinear viscoelasticity, 2-dimensional small amplitude oscillatory shear accessories, namely, accessories for analyzing nonlinear viscoelasticity, extensional viscosity fixture accessories, namely, accessories for analyzing extensional viscosity and stress, cone and partitioned plate accessories, namely, accessories for analyzing elastic materials, interfacial rheology accessories; accessories for analytical apparatus and instruments, namely sample cups and bobs; accessories for analysis apparatus and instruments, namely helical bobs and vane bobs; recorded or downloadable operating and control software for use with thermal analysis instruments