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The Telephonics 10 Ohm Ear Phone (#AMRE-TDH-39P) is a great quality speaker. It can be used with Ambco audiometers, such as the 650A, 650AB, 1000+, and 2500.
Warranty: 90 Days.
The versatile ear phone receiver is compatible with various units, including the Tremetrics RA500 Audiometer.