If you are testing a subject with Tinnitus (ringing in the ears) the pulsing option can help overcome this. The "pulsing" can also be used for clearer communication with the test subject. For instance, if you are testing a senior, you can present the "pulsing tone" and ask what they hear. If they don't respond that they hear pulsing you know they aren't hearing the tone either. This helps to eliminate "false positive" results.
The user interface of the OtoPulse is different from the OtoScreen III and OtoScreen IV. Instead of a BOOST button that must be held down to engage the 40db tone, it has a 40db-Toggle button that switches the unit back and forth between the softer tone and the 40db tone. This is convenient for testing adults and seniors when it is desireable to test at the louder 40db level first. (Note - engaging the softer tone first is required with OtoScreen III)
The most significant user interface difference is that once the unit is turned on, there is always a tone present, even if no buttons are being pressed. The buttons just serve to change the scanning frequency and sound-level intensity. Holding the 40dB-Toggle button down turns the unit off (faster than the automatic shut off function of the unit). This user interface difference changes the recommended test procedure versus the OtoScreen III and IV. See the User Manual for a more detailed explanation.
There are two models available: Standard and Pediatric. The Standard model tests at 25db and 40db sound levels. The Pediatric model tests at 20 db and 40db sound levels. The switch plate color is light-blue for both models. The type of unit (Standard or Pediatric) is indicated by a sticker inside the unit.
Every unit is calibrated on precision equipment and comes with a calibration certificate. The acoustic calibration criteria are traceable to the National Institute of Standards and Technology (NIST) for sound intensity.