Electronic instruments, namely, computerized measurement systems comprised of sensors, amplifiers and computer hardware and software for measuring thickness of parts and materials; electronic instruments, namely, computerized measurement systems comprised of sensors, amplifiers and computer hardware and software for measuring distance to and location of parts and materials in the manufacturing process and for dimensional inspection of such parts and materials; electronic instruments, namely, computerized measurement systems comprised of sensors, amplifiers and computer hardware and software for measuring the distance or amplitude of motion, reciprocation, oscillation or vibration of parts and materials; electronic instruments, namely, computerized measurement systems comprised of sensors, amplifiers and computer hardware and software for measuring semiconductor or semi-insulating wafer material dimensions and characteristics; electronic instruments, namely, computerized systems using accelerometers and computer hardware and software for measuring and analyzing imbalance and vibration of rotating machinery and performing engine trim balance for commercial and military aviation; calibrators for calibrating instruments that use accelerometers to measure and analyze imbalance and vibration of rotating machinery and perform engine trim balance