Pioneer Corporation SGY-LT90
The 2016 Pioneer SGY-LT90 is a top-end power meter. This model is fitted for Shimano's Dura Ace crankset, available in seven lengths, meter contained in a very low-profile space along the inside of the arm, with only a magnet to connect to the frame. Construction is impeccable; the meter will need close to no maintenance beyond an occasional battery change. The meter communicates over ANT or ANT+ with any computer, adding additional data when used in conjunction with one of Pioneer's cycling computers.
A good power meter.