Agilent X3501-64016 - Twistorr Medium- TMP Rack Controller, p/n X3501-64016.
Auitable for Twistorr 504,704 and 804 turbopumps.
Used but working well. Tested.

Functionality quarantee. 
Partial refund within 30 days under the following conditions:
- The buyer pays the freight back
- The refund amount is 70% of the purchase amount (for covering shipping costs)

Fast shipping within 2 working days from payment by UPS or similar traceable freight.
World wide freight time normally 5 to 7 days.

Shipped from EU area. Shippings costs are included but buyer may need handle customs fees and taxes.