Measuring or testing machines and instruments, namely, rheometers used to measure the viscoelasticity of viscoelastic materials such as plastic, gum, elastomer, gel, sol, slurry, emulsion, liquid, lubricant oil, edible oil, fuel oil, rheological fluid, flesh, fish and shellfish, human and animal body, namely, skin, internal organs, blood vessels, bones, fruits, food, namely, bread dough, pasta, noodle, wheat flour, potato starch, jelly, gelidium jelly, konjac, unsolidified concrete, plants, s...