Universities have confined spaces, chemistry, biology and engineering labs with a variety of chemical hazards and indoor air quality concerns in dormitories, classrooms and laboratories. Electronic monitors for entry into confined spaces to check for levels of combustible gases, oxygen deficiency and toxics such as hydrogen sulfide and carbon monoxide are essential. Detector tubes are another real-time gas detection tool for hundreds of gases and vapors that could be present in some of the laboratories as well as checking levels of carbon dioxide, ozone or formaldehyde in the indoor air.