Model 7DAH Grass Polygraph D.C. Driver Amplifier. These were retired from a university lab along with several other modules and related item which are listed here. Appears in good condition.
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If you find the item is not as described in the ad it may be returned for a purchase price refund. Generally, all of our items have an inspection warranty which kicks in upon delivery for a period of 7 to 14 days. It is not an operational warranty as most items sold on DOTmed require biomedical certification before use. If you require additional coverage please contact us prior to purchase.