optical equipment, namely tilting mirrors for optical measurement purposes, interferometers, etalons, gratings and optical filters for discriminating between light at different wavelengths, all for use in fiber optic test equipment; capacitance displacement monitoring devices, namely capacitance displacement sensors; fiber optic sensors for sensing temperature, pressure, humidity, position, acceleration, velocity, angle, stress and strain; multiple-axis positioning stages, namely actuators and positioners, electro-strictive actuators and positioners, piezo-electric devices for micro-positioning alignment, sensors used with control electronics to control micro-positioning devices, all for use in laboratory or commercial measurement and control systems; multiplexers and demultiplexers; electrical controllers for measuring position, sensor output, proportional, integral and differential feedback; drive amplifiers, piezo-electric and electro-strictive devices for micro-positioning alignment, for use in electrical controllers; read-out and computer display modules and interfaces therefor; scanning probe microscopy apparatus; and parts and fittings therefor for all of the aforesaid goods