Check the listing for details. Poltron Brushless Tachometer, TKE 216-06/3V 3 volt/krpm. Condition: Seller refurbished. Listed at 450.00 USD. This listing is for one Poltron Brushless Tachometer unit 3 V/krpm- does not include rotor magnet assembly, although we do have these also-Tested to be in good working order using MPM series servo motor and MPA series servo drive.These are used on the some of the following servo motor brands for velocity Feedback. Custom Servo MotorsMTS AutomationParker $450 outright purchase$325 Purchase with return of complete non working core exchange $225 we will repair for you Make " best offer" indicating your intentions. We have considerable experience repairing and testing these.In most cases they are repairable Berg Controls, LLCNew Ulm, MN See my other listings for more Custom Servo Motors, MTS Automation, and Parker products.www.bergcontrolsllc.com 507-276-9191