9 Hand-held exhaust emissions testers; portable test equipment, namely apparatus for detecting and measuring gas pressure, air quality, gas leaks, gas presence, and gas concentration; infra-red benches, namely, devices for detecting the presence and concentration of gases; infra-red benches for incorporation into gas analyzer systems, namely, devices for detecting the presence and concentration of gases; scientific, electrical and electronic apparatus and instruments for calibration of test equipment, displaying and/or printing data, monitoring, recording, indicating, data logging, analysing, sensing, detecting, measuring, checking, and metering of ambient gases, exhaust gases, environmental gas, exhaust emissions, combustion efficiency, and air quality, namely, flue gas analysers, gas leak detectors, gas pressure meters, indoor air quality meters, and vehicle emission testers; scientific, electrical and electronic apparatus and instruments for measuring and testing electrical circuits and electrical currents, but not modifying the electrical input into said electrical circuits and electrical currents, namely, multimeters, clamp meters, and non-contact voltage testers; combustion probes, namely, accessories for devices used to detect the presence and concentration of gases post-combustion; automotive emissions analysers; portable diesel smoke meters; hazardous gas detectors and warning instruments for detecting the presence of gas and includes audible and visual alarm and indicators