Measuring tools and apparatus, namely, detectors, sensors, rotational angle or position measuring apparatus, namely, position measuring sensors and controllers, linear position measuring apparatus, namely, linear encoder [ and electronic digital indicators, precision measuring apparatus, namely, spherometers, straightness measuring microscopes, micrometers, dial gauges and strain gauges, electronic measuring devices, namely, continuously weighing electronic scales, dosing weighing scales, differential weighing scales, heart rate monitors and electronic calipers, ] rotary encoders, position encoders [, speed and acceleration measuring apparatus, namely, tachometers for electric motor speed sensing and display and testers that verify the proper calibration of a vehicle's speedometer, electronic circuitry for constant voltage marker lightings and for measuring and controlling engine performance, and apparatus, namely, resistors, capacitors and diodes relating to the above goods; electronic power supplying or controlling tools and apparatus, namely, battery backup, lighting protection and surge protection, electromagnetic measuring devices, namely, electromagnetic measuring controllers, electric apparatus for communication, namely, microphones, amplifiers, loudspeakers, electric megaphones, tuner filters, receivers for wire broadcasts and wireless broadcasts, electronics-applied tools and apparatus and parts thereof, namely, computers, electronic circuitry and integrated circuitry; rotary converters and phase modifiers, magnetic cores, electromagnetic coils, intercommunication apparatus, namely, radio transmitters and receivers, modems, and cellular telephones, gasometers, electronic resistances, cardiac electrodes, medical electrodes, and welding electrodes, electric converters, and television game toys, namely, interactive video games of virtual reality comprised of computer hardware and software for home use ]