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Hand-held device comprised of chemical and heat sensors for the detection of explosives; Laser equipment for non-medical purposes; Portable detection and identification instruments using light sources and light detectors for detecting and identifying chemical and biological substances not for medical purposes; Stand-off explosives and chemical detection system comprising strobe and probe lasers, optical detectors and digital signal process units; Scientific apparatus, namely, spectrometers and parts and fittings therefor; Scientific instruments, namely, electronic analyzers for measuring, testing and detecting contaminants and environmental pollutants; Scientific instruments, namely, electronic analyzers for testing and analyzing chemical and biological substances for the presence, absence, or quantity of TARGET CHEMICALS AND CONTAMINANTS; Scientific instruments, namely, electronic analyzers for testing consumer products for the presence of contaminants