Temperature meters, namely, thermometers, temperature indicators, temperature sensors, infrared thermometers; pH meters, namely, electric meters for measuring acidity or basicity of liquids; water quality meters, namely, water testing instrumentation for monitoring and detecting contamination; light meters, namely, electric meters for measuring levels of present light in various wavelengths; distance meters, namely, sensors for the determination of distances; color meters, namely, RGB color meters and spectrophotometers; data loggers, namely, electronic recorders for storing measured values provided by measuring sensors; sound level meters, namely, electric meters for measuring sound pressure; air flow meters, namely, electric meters for measuring air flow; force meters, namely, electric meters for detecting and measuring two-dimensional distribution of force and pressure, electric meters for measuring tension and compression of an object; pressure meters, namely, pressure gauges, pressure recorders, pressure sensors, pressure transducers; weight meters, namely, scales and balances; RPM meters, namely, tachometers, rotation meters; moisture meters, namely, meters for measuring the presence of moisture in materials; thickness meters, namely, electric meters for measuring the thickness of materials; humidity meters, namely, measuring apparatus for humidity levels in gases and air; gaseous meters, namely, gas meters; radiation meters, namely, radiation measuring instruments, RF electromagnetic field meters; conductivity meters; multimeters, namely, electric meters that combine ammeters, voltmeters and ohmmeters; environmental meters, namely, electronic-based instruments for measuring environmental parameters including humidity, mold, bacteria, air quality and water quality; timing meters, namely, timing sensors