MKS Instruments Announces Second Quarter 2007 Earnings Conference Call

WILMINGTON, Mass., July 11 /PRNewswire-FirstCall/ -- MKS Instruments, Inc. (Nasdaq: MKSI), a leading worldwide provider of process control technologies for improving productivity in semiconductor and other advanced manufacturing processes, today announced that it will release second quarter 2007 financial results prior to the opening of the market on Thursday, July 26, 2007. 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 http://www.mksinstruments.com. Dial-in numbers are 1-800-240-8621 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 11093388#.

MKS Instruments, Inc. is a leading worldwide provider of process control solutions for semiconductor device manufacturing; thin-film manufacturing for flat panel displays, data storage media, architectural glass and electro- optical products; and other advanced processes. Our instruments, components and subsystems incorporate sophisticated technologies to power, measure, control, monitor, and analyze increasingly complex gas-related manufacturing processes, thereby enhancing our customers' uptime, yield and throughput, and improving their productivity and return on invested capital.

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)