Audiometric Equipment

OMI represents the family of audiometers from Micro Audiometrics and sound booths from Tremetrics. These high quality instruments have features that are ideally suited to the needs of industry and comply with all OSHA test requirements and ANSI Standards for Audiometers.

Micro Audiometric Earscan 3 (ES3)

  • Occupational health employee testing
  • Automatic threshold test (modified Hughson-Westlake)
  • Meets OSHA requirements for automatic testing
  • Compatible with OMI’s hearing conservation software package
  • Includes patch cord set, response switch (in addition to standard accessories)
  • Optional test storage



Dimensions: (L x W x H) 5.8 x 3.6 x 1.3 in ( 14.7 x 9.1 x 3.3 cm)

Weight: 9.8 ozs. ( 0.28 kg)

Power: 4 AA alkaline batteries, AC Adapter or USB power

Display: Backlit 128 x 64 Graphic LCD

Clock: Real Time, Battery Backed Up

Standards: ANSI S3.6-1996

Warranty: 5 year, limited


Frequencies: 125 to 8000 Hz

Intensity Range (TDH-39): 125 Hz: -10 dB to 65 dB HTL 250 Hz: -10 dB to 90 dB HTL 500 to 6k Hz: -10 dB to 100 dB HTL 8k Hz: -10 dB to 90 dB HTL

Step Size: 5, 10, or 20 dB

Presentation Mode: Pulsed or Continuous

Frequency Accuracy: +/- 1%

Level Accuracy: +/- 1 dB

Distortion: < 0.5%



TDH-39 Headset, 60 ohm

Carrying Case


AC Adapter

USB Cable

Response Button

Patch Cords

Operator’s Manual


Test Storage w/ Memory Card

Test Analysis

Insert Earphones, 50 ohm


HealthExplorer Database PC Software

Audiometrics Testing PC Software

Audiometric Sound Booths

To ensure a suitable test environment, OMI offers a complete line of audiometric sound booths.

Calibration Equipment

OMI has a wide selection of bio-acoustic calibrators. These instruments make OSHA-required daily calibrations a quick and easy task. They are designed to work with most manual and microprocessor audiometers.

Audiometric Supplies

Whether it’s audiometer printer paper or a new pair of headphones, OMI handles a wide variety of audiometric supplies for most brands and models of audiometers.