Sensing apparatus and instruments; sensors; gas detection sensors; photoionisation detection sensors, instruments and apparatus; sensor for detective volatile organics compounds and apparatus and instruments including such sensors; apparatus and instruments for detection, generation and measurement of flow, leaks and pressure; mercury sensors and detectors; kits containing the aforesaid apparatus and instruments; forensic testing kits; fire investigation kits; calibration kits for the aforesaid products; parts and fittings for all the above goods.;
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