PSI's Ring cyclotron is a high intensity proton cyclotron producing a CW proton beam of 2 mA. The beam is accelerated over about 180 turns from 72 MeV to 590 MeV. The Long Radial Probe, called RRL scans the beam along a machine radius over the whole range of turns, i.e. from 2048 mm to 4480 mm. A replacement for the RRL has been developed in the last years. The recently installed new probe drives three carbon fibers with 30 µm diameter through the turns and measures secondary electron emission (SE) currents, providing information on horizontal and vertical beam shape and position. Additional drives are available for a later extension of measurement capabilities. The main challenges are the coupling of the device elements to RF fields leaking from the accelerating cavities, plasma interfering with the measured signal, and the performance of the carbon fibers in a harsh environment with a high-intensity beam and RF heating. We report on the commissioning of the probe with RF and beam and discuss measurement results.