Maico MA 27 Operation Manual page 8

Operation Manual MA 27 / MA 27e
In addition to traditional manual testing, the MA 27e incorporates
a Hughson-Westlake patient controlled automatic threshold test
complying with ISO 8253. When the test is completed the results
are easily recalled from the internal memory of the MA 27e.
Talk Forward function that makes the MA 27e easy to work with
particularly in sound booth installations.
8104818 Rev.2.0 4 04/16