| III | IV | Pulse | Simple II | |
|---|---|---|---|---|
| Lower cost of calibration than OtoScreen I and OtoScreen II | ||||
| Unit has four frequencies: 500, 1000, 2000 & 4000 Hz | ||||
| 40db HL loud sound level tone | ||||
| When the unit is on there is always a tone present | ||||
| "Scan" button must be held down to present a tone | ||||
| "Boost" button must be held down to present the 40dB tone | ||||
| Unit has a 40db "Toggle" button instead of a "Boost" button | ||||
| Standard version has 25db HL for soft sound level tone | ||||
| Pediatric version available: 20db HL for soft sound level tone | ||||
| Tone pulses every 200 millisecond when "Scan" button is held down | ||||
| Unit can be converted to a version III, IV or Pulse for a fee | ||||
| Unit comes with standard rubber MX-41A ear cushion | Option | Option | Option | |
| Power on to tone delay (Seconds) | 1 Sec | 1 Sec | 0 Sec | 0 Sec |
| Automatic power off delay time (Seconds) | 4 Secs | 30 Secs | 60 Secs | 60 Secs |