MTI Instruments Inc. (MTII) announces the evolution of its vibration analysis and trim balancing systems for aircraft engines with the PBS-4100 PLUS, a fully compatible upgrade to the PBS-4100 and all other PBS systems. Features include: Data Acquisition Unit, the latest configuration of electronics for maximum performance and low maintenance, including an interactive touch screen; Calibration Wizard (automatic calibration software) and built-in troubleshooting aids to locate and isolate problems to specific components; and durability as the portable computer is cushioned within a magnesium case and is protected by internal shock absorbers and a waterproof keyboard. For more information call (800) 342-2203 or visit www.mtiinstruments.com.