MKS Instruments Announces Fourth Quarter 2007 Earnings Conference Call

WILMINGTON, Mass., Jan. 17 /PRNewswire-FirstCall/ -- MKS Instruments, Inc. (Nasdaq: MKSI), a global provider of technologies that enable advanced processes and improve productivity, today announced that it will release fourth quarter and year end 2007 financial results prior to the opening of the market on Thursday, February 7, 2008. A conference call with management will be held the same day at 8:30 a.m. (Eastern Time). The call will be broadcast live and available for replay at www.mksinstruments.com. Dial-in numbers are 1-800-257-7087 for domestic callers and 303-262-2137 for international callers. A telephone replay can be accessed for one week at 303-590-3000, pass code 11107172#.

MKS Instruments, Inc. is a global provider of instruments, subsystems and process control solutions that measure, control, power, monitor and analyze critical parameters of advanced manufacturing processes to improve process performance and productivity. Our products are derived from our core competencies in pressure measurement and control, materials delivery, gas composition and analysis, electrostatic charge management, control and information technology, power and reactive gas generation, and vacuum technology. Our primary served markets are manufacturers of capital equipment for semiconductor devices, and for other thin film applications including flat panel displays, solar cells, data storage media, and other advanced coatings. We also leverage our technology in other markets with advanced manufacturing applications including medial equipment, pharmaceutical manufacturing, and energy generation and environmental monitoring.

SOURCE MKS Instruments, Inc.

CONTACT: Ron Weigner, Vice President and Chief Financial Officer of MKS
Instruments, Inc., 1-978-284-4000
Web site: http://www.mksinst.com
(MKSI)