The Casella CEL division for the working environment is a renowned leader in the development, manufacture and supply of industrial hygiene, occupational health monitoring equipment. The instrumentation includes real-time dust monitors, personal sampling pumps, sound level meters, noise dosimeters, gas detectors and VOC (PID) monitors.

The Casella Monitor division for the natural environment manufactures high quality ambient gas analysers and complete roadside and ambient pollution monitoring systems as well as meteorological equipment. Products include NO_X and SO_X analysers, PM₁₀ and PM_2.5 monitors, rain gauges wind speed and direction systems as well as fully automatic weather stations.