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Ambco Model 650A and 650AB Audiometers 
The Ambco Model 650A and the Ambco Model 650AB audiometers are simple and low-cost manual audiometers that can be used for almost any application where a manual puretone audiometer is needed. The Model 650A and 650AB are similar with the exception that the 650AB can be used as a battery powered instrument which increases the portability of the instrument because you can perform hearing tests anywhere without having to be dependant upon having an electrical outlet nearby. Download the price list below for current prices on the Ambco 650 series audiometers.