A facility to stop and reaccelerate rare isotope beams is under commissioning at Michigan State University. It is based on gas stopping devices and a superconducting heavy-ion linac. Initially the facility will accelerate rare isotopes produced by the Coupled Cyclotron Facility. Later it will be operated as part of the Facility for Rare Isotope Beams (FRIB). The diagnostics system for the reacceler-ator is particularly challenging because of the low energy and low intensity of the ion beam. It is largely based on detection techniques and instrumentation typically developed for nuclear and particle physics. Some of the devices already have been used to commission ReA and achieve project milestones, while others are in assembly and fabrication stages. A description of the devices and the current status of the diagnostics system will be presented along with examples of the experience so far with the diagnostics operation at the reaccelerator.