9 Scientific, weighing, measuring, checking, inspection apparatus and instruments, namely length measuring gauges, weighing scales, gas sensors, light sensors, humidity sensors, liquids sensors, noise sensors, air sensors; metrology instruments being optical frequency metrology devices, optical metrology inspection system comprised of a light source, one or more cameras and sensors in communication with computer software, hardware, phones; apparatus, namely electric sensors, optical sensors, mechanical sensors, chemical sensors, for analyzing gases, light, humidity, liquids, fluids, noise, air; altimeters; aerometers; anemometers; barometers; hygrometers; sound locating instruments being electric sensors, mechanical sensors; heat regulating apparatus, namely electric heat sequencers, electric control devices for heating management, gas flow meters, thermostats; flow meter; detectors and sensors for gas, light, humidity, liquids, noise, air; portable detectors for monitoring breathing quality and environmental nuisance, namely, devices for measuring air quality, allergen particles, gas and odor, humidity, temperature, light, noise and vibration; indicators being electric sensors, mechanical sensors, chemical sensors for gas, light, humidity, liquids, noise, air