OHD, Inc. specializes in Occupational Health & IH Instrumentation and software to help protect your employee’s health & manage your occupational risks. Whether you are looking for the Quantifit® Respirator Fit Tester, Noise Dosimeters, Sound Level Meters, Environmental Noise Monitoring System, Spirometers, or Audiometers 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.