Offered here is a Wilcoxon Research CC701 Low-noise PiezoFET Charge Converter. It converts the charge output  from a vibration sensor to a voltage output, with 1 mV/pC sensitivity and 10Hz to 25kHz frequency response. See complete specs at the Wilconox website (cut and paste it; eBay doesn't allow us to post outside links, no matter how helpful...):
buy.wilcoxon.com/amfile/file/download/file_id/702/product_id/505/

This unit works fine and has been sitting idle for over a dozen years. It is in excellent condition..
  • Functional condition : Works fine
  • Cosmetic condition :  Excellent
  • Accessories included:  none
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Warranty - Unless explicitly stated otherwise in the item description, all items are guaranteed for proper operation. The warranty is 14 days from receipt. It is designed to give you sufficient time to use the item and have confidence that it is working properly. It is not a try-out period; it is a return-or-replace guarantee in the unlikely event that the item arrives not working properly.

Shipping - This item will be shipped by in the ConUS by Priority Mail. If you prefer a different method for shipping this item to you, please bring it to my attention and I'll work with you.