Battery case type 504 for all DEHAG Nystagmus spectacles

Battery housing for adjustable power supply of nystagmus spectacles according to Dr. Blessing: Type 521 and Type 522 and according to Prof. Frenzel Types 501 and 502.
In order to enable independent (mains) operation, the Nystagmus spectacles can alternatively be supplied with power by the DEHAG battery housing. It is powered by three size C LR14/AM-2 batteries (1.5 volt baby cells).

Scope of delivery: 1 piece (batteries are not included!)
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