Laboratory services, namely, calibration of measuring devices for others; calibration, testing, and certification services, namely, calibration of measuring devices in the terms of legal metrology, performance testing for the certification of permeation devices for others for the purpose of certification

permeation devices, namely, permeation tubes for use in generation of calibration gas standards; diffusion devices, namely, permeable diffusion gas container for calibrating and quantifying gas

aerosol calibrating and quantification devices, namely, calibrated containers for gas; vapor measuring devices comprised of gas sample collection devices comprised of gas analyzers; disposable gas and liquid storage containers for calibrating and quantifying gas, disposable permeable diffusion gas containers for calibrating and quantifying gas; portable field use gas permeation calibrators; personal mounted gas detectors and explosive detectors

microprocessor-controlled programmable measurement apparatus for displaying in cartesian or polar coordinates high-resolution linear and rotary measurements; display, control, and other accessories therefor comprising microprocessors, keypads, foot-switches, edge detectors, computer printers, cables, computer operating software, mini-scales, micrometers, mounting parts therefor

AIR TRACER MATERIALS-NAMELY, FINELY POWDERED ZINC-CADMIUM SULPHIDE

ENGINEERING SERVICES IN THE FIELD OF DIFFUSION METEOROLOGY