Profile: Audiometric Services by petrehn specializes in audiometric equipment calibration and repair. We calibrate all equipments to the applicable ANSI standard that meets/exceeds OSHA 1983 exhaustive calibration specifications. We calibrate air conduction audiometer, tympanometer, earscan, automatic/microprocessor audiometer, tympanometer with audiometer, clinical impedance and clinical audiometer. We also repair hearing aid testing/fitting equipments. We also perform calibration as per current manufacturer's specifications for non-ANSI standard equipments.