Acoustic meters; Concentration meters; Derived-unit measuring machines and apparatus; Electric meters; Electrical energy utilization metering devices complete with related software; Electromagnetic apparatus used to generate or measure magnetic fields; Electronic devices, namely, energy meters for tracking and monitoring energy usage; Electronic products for the generation, measurement, and analysis of audio signals, namely, audio analyzers; Electronic test and measurement devices for use in the fields of networks and telecommunications, namely, instrumentation used to test and certify new and existing data and voice communication cable and coaxial cable; Electronic testing equipment, namely, sound level meters; Environmental monitoring system comprised of meters and sensors that measure pressure, humidity, temperature and includes alarm and reporting functions; Frequency meters; Measuring instrumentation and apparatus, namely, digitizers; Panel meters, namely, an electronic instrument that displays an input signal in either a digital or analog form; Portable electronic recorder for measuring and recording multiple voltage, current and thermocouple readings from various transducers; Resistance measuring instruments; Scientific measuring instruments, namely, conductivity meters; Sound level meters; Temperature meters not for medical use; Vibration meters