Noisemeters; Alarms for the detection of inflammable gases; Carbon dioxide detectors; Electronic ultrasonic test equipment, namely, ultrasonic flaw detectors, thickness testers and hardness testers, for non-medical use; Gas testing instruments; Geiger counters; Infrared detectors; Pressure recorders; Radiation detectors; Scientific instruments, namely, electronic analyzers for measuring, testing and detecting contaminants and environmental pollutants