9 Scientific, electrical and electronic apparatus and instruments, for testing test equipment, calibration of test equipment, displaying, printing, monitoring, recording, indicating, logging, analysing, sensing, detecting, measuring, and checking, data relating to metering of electricity, electrical and electronic circuits, ambient gases, exhaust gases, environmental gas, exhaust emissions, combustion efficiency, environmental parameters, and air quality, namely, flue gas analysers, gas leak detectors, gas pressure meters, indoor air quality meters, and vehicle emission testers; room air flow measuring instruments, air flow meters, flue draft pressure meters, gas pressure meters, gas to air ratio meters, refrigerant gas leak detectors, thermal imaging cameras for temperature measurement, differential thermometers, pocket temperature thermometers, infrared thermometers, combustion smoke probes, and flue gas and pressure probes none of the foregoing for medical use; Scientific, electrical and electronic apparatus and instruments, namely, combustion efficiency analysers and combustion testing probes, to measure stack temperature, flue pressure, and gas levels, all in order to calculate the efficiency of boilers, heaters and furnaces; automotive emissions analysers, namely, gas analysers and diesel smoke meters; hazardous gas detectors for detecting the presence of gases and includes audible and visual alarm and indicators; 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, digital multimeters, clamp meters, and voltage testers, all being electronic and electrical test meters; replacement parts and fittings for all of the aforesaid goods