Calorimeters; replacement parts and fittings for calorimeters; laboratory apparatus and instruments for thermal analysis; laboratory sample pans, pan covers, and crimper presses for thermal analysis instruments; accessories for thermal analysis instruments, namely, autosamplers, photocalorimeters, microscope accessories, spectrometers, and instruments for measuring the optical characteristics of samples; analytical instrument accessories for controlling sample temperature; control and data analysis software for thermal analysis instruments.;