Condition Monitoring Group (CMG) is a company that specializes in vibration analysis and the science of structural and rotating machinery condition monitoring for the aviation, automotive, and power industries. Its key subsidiaries include Helitune, Beran Instruments, Systems & Electronics, Prosig, and Semia. The company designs, manufactures, installs, and services helicopter vibration solutions, condition monitoring systems, data acquisition and structural health monitoring systems, noise, vibration and harshness (NVH) systems, acoustical testing solutions, etc.