MKS Instruments Announces First Quarter 2007 Conference Call

WILMINGTON, Mass., April 5 /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 first quarter 2007 financial results prior to the opening of the market on Thursday, April 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 1-800-218-4007 for domestic callers and 303-262-2130 for international callers. A telephone replay can be accessed for one week at 303-590-3000, pass code 11087365#.

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., 1-978-284-4446
Web site: http://www.mksinstruments.com
(MKSI)