Optical apparatus and instruments, namely, digital microscopes, spectacles; Sensors for measurement and not for medical use, namely, force sensors, pressure sensors, vector sensors, torque sensors, weight sensors, temperature sensors and acceleration sensors; Derived-unit measuring machines and apparatus; Pressure gauges; measuring devices, electric, namely, load cells, strain gages, weighing scales, balance scales and comparators; precision measuring apparatus, namely, tachometers, accelerom...