OHD specializes in Occupational Health & Industrial Hygiene Instrumentation and software to help protect your employees’ health & manage your occupational risks. Whether you are looking for the Quantifit® Respirator Fit Tester, Noise Dosimeters, Sound Level Meters, Environmental Noise Monitoring Systems, Spirometers, Audiometers or Online Respirator Clearances we can provide you with a complete solution. With a full service calibration and service department, OHD’s goal is to serve each client with the excellence and professionalism expected by today’s competitive market.