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Quest Sound Level Meters School Health Instruments Sound Level Meters Spirometers Spirometer Data Switch Vision Testers T2 Vision Testers: Quest Q-400/Q-500. The Q-400 and Q500 have been replaced by the Noise-Pro dosimeter. Click here for a description. Quest NoisePro Dosimeters. Reasons to upgrade to NoisePro ® DL: Simple menu. QUEST SERVICE POLICY Service Policy The Quest product you have purchased is one of the finest acoustic instruments available. It is backed by our full one year warranty which seeks complete customer satisfaction. This is your assurance that you can expect promp t courteous service for your equipment from the entire Quest service organization.