Check the listing for details. Precision External Clock for TEAC NT-505 (DIY kit). Color: Black, Condition: Used. Listed at 329.95 USD. The external clock source was made 1 year ago for my TEAC NT-505 audio DAC. It has been reliable and with precision. I enjoy it very much. One friend came by and took it. So I made more. The unit is a homemade DIY kit based on used parts. User will have to assemble it together such as installing foot pads. Unit has 24-hour burn-in and calibration before shipping. Picture shows the 11-digit instrument I use for calibration. Except the black clock source unit, everything else in picture is for demonstration purpose only and is not included. Unit needs power cord and BNC cable in order to operate. No cable is included. Free shipping. Sales tax and potential import charges or duties are buyer's responsibility. Note: Middle digits in the third picture are missing due to scanning display. Camera is faster capture than display of digital frequency counter. The fourth picture shows static version.