MKS Instruments Reports Revised Third Quarter 2009 Guidance and Announces Earnings Conference Call

MKS Instruments Reports Revised Third Quarter 2009 Guidance and Announces
Earnings Conference Call

ANDOVER, Mass., Oct. 5 /PRNewswire-FirstCall/ -- MKS Instruments, Inc.
(Nasdaq: MKSI), a global provider of technologies that enable advanced
processes and improve productivity, today announced that third quarter
revenues and non-GAAP earnings will exceed the high end of its guidance.
Third quarter revenue could increase approximately 34% sequentially, ranging
from $105 million to $107 million, and surpassing the Company's high end
guidance of $92 million. The Company expects to return to profitability on a
non-GAAP basis and could see non-GAAP net income of approximately $0.02 to
$0.04 per diluted share, compared to its original guidance of a net loss of
($0.18) to ($0.07) per basic share. GAAP net loss in the third quarter, which
includes the effect of a lower effective income tax benefit, could be
approximately ($0.14) to ($0.11) per basic share.

Leo Berlinghieri, Chief Executive Officer and President, said, "The increase
in our business reflects the higher levels of sales at our semiconductor OEM
customers and is consistent with recent, positive announcements by industry
research firms. Chip unit sales are increasing, semiconductor front end
equipment utilization rates are now above 95%, and a number of our
Semiconductor OEM customers have increased their third quarter revenue
guidance. As we have demonstrated this quarter, we are well positioned to meet
the increased demand."

Management will release third quarter, 2009, financial results prior to market
opening on Thursday, October 22, 2009. A conference call will be held the same
day and is scheduled for 8:30 a.m. (Eastern Time). Dial-in numbers are
1-888-549-7880 for domestic callers and 480-629-9866 for international
callers. The call will be broadcast live and available for replay at
www.mksinstruments.com. To hear a telephone replay through October 29, 2009,
dial 303-590-3030, pass code 4163117#.

The financial results that exclude certain charges and special items are not
in accordance with Accounting Principles Generally Accepted in the United
States of America (GAAP). MKS' management believes the presentation of
non-GAAP financial measures, which exclude costs associated with acquisitions
and special items and include a normalized income tax rate, is useful to
investors for comparing prior periods and analyzing ongoing business trends
and operating results.

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 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 medical equipment, pharmaceutical manufacturing, energy
generation, and environmental monitoring.

This release contains projections or other forward-looking statements within
the meaning of the Private Securities Litigation Reform Act of 1995, Section
27 of the Securities Act, and Section 21E of the Securities Exchange Act
regarding MKS' future growth and the future financial performance of MKS.
These projections or statements are only predictions. Actual events or results
may differ materially from those in the projections or other forward-looking
statements set forth herein. Among the important factors that could cause
actual events to differ materially from those in the projections or other
forward-looking statements are the fluctuations in capital spending in the
semiconductor industry, fluctuations in net sales to MKS' major customers,
potential fluctuations in quarterly results, the challenges, risks and costs
involved with integrating the operations of MKS and any acquired companies,
dependence on new product development, rapid technological and market change,
acquisition strategy, manufacturing and sourcing risks, volatility of stock
price, international operations, financial risk management, and future growth
subject to risks. Readers are referred to MKS' filings with the Securities
and Exchange Commission, including its most recent Annual Report on Form 10-K,
for a discussion of these and other important risk factors concerning MKS and
its operations. MKS is under no obligation to, and expressly disclaims any
obligation to, update or alter its forward-looking statements, whether as a
result of new information, future events or otherwise.

SOURCE MKS Instruments, Inc.

Ronald C. Weigner, Vice President, Chief Financial Officer & Treasurer of MKS
Instruments, Inc., +1-978-645-5576