Contacts:         Kimberly Allen                         Jennifer Howard-Brown
                  Investor Relations Manager             Media Relations Manager
                  (512) 683-6873                         (512) 683-8713

   National Instruments Reports Fourth Consecutive Quarter of Revenue Growth
           Company Announces First-Ever Dividend, Record Cash Balance

AUSTIN,  Texas - July 23,  2003 -  National  Instruments  (Nasdaq:  NATI)  today
announced  revenue of $100.2  million  for the second  quarter of 2003,  a seven
percent  increase from the second  quarter of 2002,  and the fourth  consecutive
quarter of year-over-year revenue growth. Fully diluted earnings per share (EPS)
for Q2 were 14 cents,  including  patent  litigation  expenses of $0.7  million,
which  amounts to $0.01 per share.  NI also  reported net income of $7.4 million
and a record cash balance of $168 million for Q2 2003,  up $10 million from last
quarter.

With more than 42 consecutive  quarters of profitable  operation,  a record cash
balance  and the recent  reduction  to the  dividend  tax rate,  the NI Board of
Directors has declared the  company's  first-ever  quarterly  cash dividend of 5
cents per common share,  payable Aug. 29, 2003 to shareholders of record Aug. 4,
2003.

"Our  investment  in R&D  continues  to pay off.  In Q2,  we  released  more new
products than in any quarter in the past six years, including LabVIEW 7 Express,
the most  significant  upgrade  to our  flagship  software  product in a decade.
LabVIEW 7 Express positions us for continued technical  leadership well into the
next decade," said Dr. James Truchard, NI CEO. "Additionally, with the company's
track record of strong  profitability,  we are pleased to declare our first-ever
dividend   payment  as  another  way  of  delivering   long-term  value  to  our
shareholders."

                               Q2 2003 Highlights

     Fourth  consecutive  quarter  of  year-over-year   revenue  growth;   solid
profitability with diluted EPS of 14 cents

     First-ever  quarterly dividend payment of 5 cents per common share,  record
cash balance of $168 million

     Major product  introductions,  including  entire LabVIEW 7 Express  product
family,  Compact  Vision System for  industrial  machine vision and the NI ELVIS
instrumentation system for higher education

     Record number of visits to ni.com and record revenue  generated through the
Web store

     Successful upgrade of North American ERP Systems to Oracle 11i

     Court ruling confirmed jury verdict finding three LabVIEW patents valid and
infringed by The MathWorks Inc.'s Simulink product

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National Instruments Reports Fourth Consecutive Quarter of Revenue Growth
July 23, 2003
Page 2


"With almost $200  million in revenue for the first six months of this year,  we
are on target to set a new revenue  record in 2003," said Alex  Davern,  NI CFO.
"We are  especially  pleased  to see our growth  increase  in Q2 given that U.S.
industrial  production decreased at an annual rate of more than three percent in
Q2.  We  believe  this  growth  is a  result  of  our  significant  new  product
introductions."

Geographically,  the  growth  of  revenue  in U.S.  dollar  terms for Q2 2003 as
compared  to Q2 2002 was as  follows:  Asia,  up 32  percent;  Europe,  up seven
percent;  and flat in the Americas  giving overall  growth of seven percent,  up
from five percent  last  quarter.  In local  currency  terms,  revenue was up 40
percent in Asia, down seven percent in Europe, and flat in the Americas.

Given the continued  uncertainty in global economic  conditions,  NI anticipates
mid to high single digit, year-over-year revenue growth in Q3 2003. In addition,
the company estimates  earnings per share will be in the range of 12 to 16 cents
per share for Q3 2003.  This EPS estimate is net of the $1 million NI expects in
patent litigation expenses in Q3.

In conjunction  with NIWeek 2003, the company's  annual  customer and technology
conference,  NI will  host an  analyst  conference  on  Thurs.,  Aug.  14.  More
information  about the  conference  is available by  contacting  the NI investor
relations department at (512) 683-5242.

Interested  parties  can  listen to a  conference  call  today,  July 23,  2003,
beginning at 4 p.m. CDT, at ni.com/call. Replay information will be available by
calling (719)  457-0820,  confirmation  code  #764588,  from 7 p.m. CDT July 23,
2003, through July 30, 2003, at 12 a.m. CDT.

This release  contains  "forward-looking  statements,"  including  the company's
ability  to deliver  record  revenue,  return on R&D  investment,  and  expected
revenue,  earnings,  and litigation  expenses.  These are subject to a number of
risks and  uncertainties,  including  the risk of adverse  changes in the global
economy,  delays in the  release of new  products,  unforeseen  developments  in
litigation,  fluctuations  in  customer  demand for NI  products,  manufacturing
inefficiencies,  and foreign  exchange  fluctuations.  Actual results may differ
materially from the expected results. The company directs you to documents filed
with the SEC for other risks associated with the company's future performance.

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National Instruments Reports Fourth Consecutive Quarter of Revenue Growth
July 23, 2003
Page 3

About National Instruments

National Instruments  (www.ni.com) is a technology pioneer and leader in virtual
instrumentation - a revolutionary concept that has changed the way engineers and
scientists  approach  measurement  and  automation.  Leveraging  the PC and  its
related technologies,  virtual instrumentation increases productivity and lowers
costs for customers worldwide through easy-to-integrate software, such as the NI
LabVIEW graphical  development  environment,  and modular hardware,  such as PXI
modules  for  data   acquisition,   instrument   control  and  machine   vision.
Headquartered  in Austin,  Texas,  NI has more than 3,000  employees  and direct
operations  in 40  countries.  In 2002,  the company sold  products to more than
25,000  different  companies in more than 80 countries around the world. For the
past four consecutive  years,  FORTUNE magazine has named NI one of the 100 best
companies to work for in America.

Readers may obtain investment  information from the company's investor relations
department at (512) 683-5090,  by sending e-mail to nati@ni.com or on the Web at
www.ni.com/nati.

The condensed consolidated balance sheets,  statements of income, and cash flows
to follow.

LabVIEW(TM), NI(TM) and ni.com(TM) are trademarks of National Instruments. Other
product  and  company  names  listed  are  trademarks  or  trade  names of their
respective companies.

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National Instruments Reports Fourth Consecutive Quarter of Revenue Growth
July 23, 2003
Page 4


                              National Instruments
                      Condensed Consolidated Balance Sheets
                                 (in thousands)


                                               June 30,     December 31,
                                                 2003           2002
                                             ------------   ------------
                                              (unaudited)
ASSETS
Current assets:
   Cash and cash equivalents                   $  28,062      $  40,240
   Short-term investments                        140,029        113,638
   Accounts receivable, net                       61,760         62,981
   Inventories                                    35,896         39,247
   Other current assets                           18,787         21,860
                                             ------------   ------------
     Total current assets                        284,534        277,966

Property and equipment, net                      150,395        152,133
Intangibles, net and other assets                 38,835         28,615
                                             ------------   ------------
Total assets                                   $ 473,764      $ 458,714
                                             ============   ============

LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
   Accounts payable                            $  25,436      $  25,578
   Accrued expenses                               34,099         40,935
                                             ------------   ------------
    Total current liabilities                     59,535         66,513

Deferred income taxes                              5,140          5,738
                                             ------------   ------------
    Total liabilities                             64,675         72,251
                                             ------------   ------------

Stockholders' equity:
  Common stock                                       516            511
  Additional paid-in capital                      79,773         72,063
  Retained earnings                              335,980        321,813
  Other                                           (7,180)        (7,924)
                                             ------------   ------------
    Total stockholders' equity                   409,089        386,463
                                             ------------   ------------
    Total liabilities and
     stockholders' equity                      $ 473,764      $ 458,714
                                             ============   ============


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National Instruments Reports Fourth Consecutive Quarter of Revenue Growth
July 23, 2003
Page 5

                              National Instruments
                   Condensed Consolidated Statements of Income
                      (in thousands, except per share data)

                                    Three Months               Six Months
                                   Ended June 30,            Ended June 30,
                                     (unaudited)               (unaudited)

                                  2003         2002         2003         2002
                               ----------   ----------   ----------   ----------
Net sales                      $ 100,165    $  93,505    $ 199,338    $ 188,244
Cost of sales                     27,150       26,603       53,163       51,961
                               ----------   ----------   ----------   ----------
Gross profit                      73,015       66,902      146,175      136,283
                               ----------   ----------   ----------   ----------

Sales and marketing               38,124       33,566       76,669       68,974
Research and development          16,876       15,734       32,127       31,667
General and administrative         8,469        7,528       16,806       14,809
Patent litigation                    732        1,314        3,434        1,819
                               ----------   ----------   ----------   ----------
  Total operating expenses        64,201       58,142      129,036      117,269
                               ----------   ----------   ----------   ----------

Operating income                   8,814        8,760       17,139       19,014

Interest income, net                 620          839        1,306        1,635
Foreign exchange loss, net           340          217          325         (677)
Other income, net                     98          445          119          522
                               ----------   ----------   ----------   ----------

Income before income taxes         9,872       10,261       18,889       20,494
Provision for income taxes         2,468        2,873        4,722        5,738
                               ----------   ----------   ----------   ----------

Net income                     $   7,404    $   7,388    $  14,167    $  14,756
                               ==========   ==========   ==========   ==========

Earnings per share:
  Basic                        $    0.14    $    0.14    $    0.28    $    0.29
                               ==========   ==========   ==========   ==========
  Diluted                      $    0.14    $    0.14    $    0.27    $    0.27
                               ==========   ==========   ==========   ==========

Weighted average shares
 Outstanding:
  Basic                           51,490       51,449       51,324       51,331
                               ==========   ==========   ==========   ==========
  Diluted                         53,633       53,974       53,453       53,966
                               ==========   ==========   ==========   ==========


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National Instruments Reports Fourth Consecutive Quarter of Revenue Growth
July 23, 2003
Page 6

                              National Instruments
                      Consolidated Statements of Cash Flows
                                 (in thousands)

                                                           Six Months Ended
                                                               June 30,
                                                              (unaudited)
                                                          2003           2002
                                                       ----------     ----------

Cash flow from operating activities:
Net income                                             $  14,167      $  14,756
Adjustments to reconcile net income to cash
from operating activities:
  Charges to income not requiring cash outlays:
    Depreciation and amortization                         12,390          9,922
      Benefit from deferred income taxes                    (965)        (3,620)
    Tax benefit from stock option plans                    1,315          1,011
  Changes in operating assets and liabilities:
    (Increase) decrease in accounts receivable             1,221         (6,036)
    Decrease in inventory                                  3,351             97
      Decrease in prepaid expense and other assets         2,511            336
    Increase (decrease) in current liabilities            (6,978)         5,024
                                                       ----------     ----------
  Net cash provided by operating activities               27,012         21,490
                                                       ----------     ----------

Cash flow from investing activities:
Capital expenditures                                      (7,759)       (15,607)
Capitalization of internally developed software           (8,432)        (1,386)
Additions to other intangibles                            (4,323)        (1,489)
Purchases of short-term investments                      (77,042)       (81,026)
Sales of short-term investments                           50,651         83,414
                                                       ----------     ----------
  Net cash used in investing activities                  (46,905)       (16,094)
                                                       ----------     ----------

Cash flow from financing activities:
Proceeds from issuance of common stock, net of
repurchases                                                7,715          6,095
                                                       ----------     ----------
  Net cash provided by financing activities                7,715          6,095
                                                       ----------     ----------

Net (decrease) increase in cash and cash equivalents     (12,178)        11,491
Cash and cash equivalents at beginning of period          40,240         49,089
                                                       ----------     ----------

Cash and cash equivalents at end of period             $  28,062      $  60,580
                                                       ==========     ==========


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