We specialize in the: Sales; Leasing; Repair Service; Training; Instrument Management; On-Site Service and Calibration; Calibration Services of portable and permanent gas detection instruments, photo-ionization detectors, industrial hygiene equipment, air sampling equipment, landfill monitors, water quality monitors, calibration gases and accessoriesThe word ‘Demesa’ originates from Detection-Measurement-Safety. We identified ourselves to what our strengths are. Our knowledge and experience extends itself over 20 years. When we say ‘Instrument Specialist’ we are confident you will get the best service and knowledge. We are committed to you our customer, our partner.Based in Oakville, Ontario, we offer a wide variety of products. We distribute products from proven companies such as MSA (Mine Safety Appliance), RKI Instruments, Heron Instruments, Hanna Instruments, and Pelican Cases. We repair and service all the instruments we distribute as well as the one we don’t. We sell calibration gases for all gas and VOC monitors. We also offer Preventative Maintenance Programs in order to serve you better..