Hygrometers; Acidity meters; Air quality measurement apparatus, namely, particle counters; Carbon dioxide detectors; Concentration meters; Dust measuring apparatus; Environmental monitoring system comprised of meters and sensors that measure pressure, humidity, temperature and includes alarm and reporting functions; Fine dust measuring apparatus; Flow meters; Height measuring instruments; Measuring apparatus for temperature and humidity levels in gases and solid substances; Measuring apparatus, namely, laser distance meters; Measuring apparatus, namely, rain gauges; Measuring instrumentation and apparatus, namely, digitizers; Panel meters, namely, an electronic instrument that displays an input signal in either a digital or analog form; pH meters; Portable dust measuring apparatus; Portable ultrafine dust measuring apparatus; Soil moisture meters; Soil sampling equipment, namely, tubular liners or tubular sleeves; Surveying apparatus and instruments; Technical measuring, testing and checking apparatus and instruments for measuring, testing and checking the temperature, pressure, quantity and concentration of gas and liquids; Water activity meters