Metronomes; Switchgears; Air analysis apparatus; Calibrated rainwater collection containers for scientific purposes; Carbon monoxide detectors; Electric buzzers; Electron microscopes; Food timers; Leak detecting device for water supplied home appliances consisting of water sensor, control unit with audible alarm and water valves; Meat thermometers; Microcontrollers for internet of things (IoT) enabled devices; Passive infrared detectors; Pressure sensors; Rechargeable batteries; Scientific in...