Test – Store – Reward – Review – Interact. MedRx has integrated National Acoustic Laboratories technology and is now offering Visual Reinforced Audiometry as an add-on to the new MedRx Studio Software. The VRA system takes a new approach to VRA testing. This system uses an iOS device to act as an audiometer and VRA controller. A clinician is able to adjust level, frequency, presentation ear, presentation and visual rewarding from the MedRx iVRA iOS app. Take advantage of the three test modes: conditioning, manual and automatic testing. Change the way you VRA with the all new MedRx iVRA. A2D+ Audiometer, Stealth Audiometer and ARC compatible.