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

           National Instruments Reports Record Third Quarter Revenue,
                            19% Growth in Net Income
              LabVIEW 7 Express Drives Double-Digit Software Growth

AUSTIN,  Texas - Oct.  23,  2003 - National  Instruments  (Nasdaq:  NATI)  today
reported  net income of $8 million,  up 19 percent from Q3 2002.  Third  quarter
revenue was a record $105 million,  a 9 percent  increase from the third quarter
of 2002, and the fifth  consecutive  quarter of  year-over-year  revenue growth.
Fully diluted earnings per share (EPS) for Q3 were 15 cents.

"Our  commitment  to investing in R&D remains a key driver for our growth," said
Dr. James Truchard, NI CEO. "More than 350 man-years of development on LabVIEW 7
Express and next-generation DAQmx driver software has paid off this quarter with
strong double-digit software growth. With many new products and record sales for
data  acquisition,  modular  instrumentation  and distributed  I/O products,  we
delivered 9 percent growth in revenue and 19 percent growth in profitability."

Q3 2003 Highlights

     Record third quarter revenue,  fifth consecutive  quarter of year-over-year
revenue growth

     Revenue up 9 percent, net income up 19 percent year-over-year

     Double-digit  growth for software sales and record  quarterly sales of data
acquisition,  modular  instrumentation  and  distributed  I/O  products

     Major  product  releases,   including  PXI  100  MS/s  mixed-signal  suite,
TestStand 3.0, LabWindows/CVI 7.0, Measurement Studio 7.0 and MATRIXx 6.3

     Record cash and short term investments of $172 million

     Cash dividend of 5 cents per common share

"We were  pleased to see our growth  improve in Q3 and believe this was a result
of our  strong  new  product  output  and an  early  stage  recovery  in  global
manufacturing,"  said Alex Davern,  NI CFO. "We reported  record revenue for the
first nine months of the year, reinforcing our expectation of record revenue for
the year."

                                    - More -



National Instruments Reports Record Third Quarter Revenue, 19% Growth in Net
Income
Oct. 23, 2003
Page 2

Geographically,  the  growth  of  revenue  in U.S.  dollar  terms for Q3 2003 as
compared to Q3 2002 was as follows:  Europe, up 18 percent; Asia, up 18 percent;
and  Americas,  up 1 percent,  giving  overall  growth of 9  percent,  up from 7
percent  last  quarter.  In local  currency  terms,  revenue was up 3 percent in
Europe,  up 33 percent in Asia,  up 1 percent in the  Americas,  giving  overall
local currency growth of 7 percent, up from 3 percent last quarter.

NI  anticipates   record  revenue  for  2003  and  expects  high   single-digit,
year-over-year  revenue  growth in Q4 2003. In addition,  the company  estimates
earnings per share will be in the range of 20 to 23 cents per share for Q4 2003.

Interested  parties  can listen to a  conference  call  today,  Oct.  23,  2003,
beginning at 4:00 p.m. CDT, at ni.com/call. Replay information will be available
by calling (719) 457-0820, confirmation code #262922, from Oct. 23, 2003 at 7:00
p.m. CDT, through Oct. 30, 2003 at 12:00 a.m. CDT.

This release contains "forward-looking  statements," including R&D investment as
a driver  for  growth,  recovery  in  global  manufacturing,  and the  company's
expectations  regarding  record  revenue  for the year,  revenue  growth for the
fourth quarter, and estimated earnings for the fourth quarter.  These statements
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,
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.

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.

                                    - More -



National Instruments Reports Record Third Quarter Revenue, 19% Growth in Net
Income
Oct. 23, 2003
Page 3


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, NI, ni.com, MATRIXx, Measurement Studio and TestStand are trademarks of
National  Instruments.  Other product and company names listed are trademarks or
trade names of their respective companies.

                                    - More -




National Instruments Reports Record Third Quarter Revenue, 19% Growth in Net
Income
Oct. 23, 2003
Page 4

                              National Instruments
                      Condensed Consolidated Balance Sheets
                                 (in thousands)



                                                   September 30,    December 31,
                                                       2003             2002
                                                   -------------    ------------
                                                    (unaudited)
ASSETS
Current assets:
  Cash and cash equivalents                        $    34,015      $   40,240
  Short-term investments                               138,210         113,638
  Accounts receivable, net                              68,313          62,981
  Inventories                                           38,448          39,247
  Other current assets                                  18,199          21,860
                                                   -------------    ------------
    Total current assets                               297,185         277,966

Property and equipment, net                            151,126         152,133
Intangibles, net and other assets                       40,365          28,615
                                                   -------------    ------------
Total assets                                       $   488,676      $  458,714
                                                   =============    ============

LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
  Accounts payable                                 $    26,108      $   25,578
  Accrued expenses                                      36,021          40,935
                                                   -------------    ------------
   Total current liabilities                            62,129          66,513

Deferred income taxes                                    5,402           5,738
                                                   -------------    ------------
   Total liabilities                                    67,531          72,251
                                                   -------------    ------------

Stockholders' equity:
  Common stock                                             518             511
  Additional paid-in capital                            86,097          72,063
  Retained earnings                                    341,349         321,813
  Other                                                 (6,819)         (7,924)
                                                   -------------    ------------
   Total stockholders' equity                          421,145         386,463
                                                   -------------    ------------
   Total liabilities and stockholders' equity      $   488,676      $  458,714
                                                   =============    ============

                                    - More -




National Instruments Reports Record Third Quarter Revenue, 19% Growth in Net
Income
Oct. 23, 2003
Page 5

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





                                            Three Months Ended       Nine Months Ended
                                               September 30,           September 30,
                                          ----------------------  ----------------------
                                             2003        2002        2003        2002
                                          ----------  ----------  ----------  ----------
                                                                  
Net sales                                 $ 104,644    $ 96,020   $ 303,983   $ 284,264
Cost of sales                                27,434      25,196      80,598      77,157
                                          ----------  ----------  ----------  ----------
  Gross profit                               77,210      70,824     223,385     207,107
                                          ----------  ----------  ----------  ----------

Sales and marketing                          40,282      36,679     116,951     105,653
Research and development                     18,370      16,095      50,497      47,762
General and administrative                    8,438       8,224      25,244      22,559
Patent litigation                               362       1,220       3,796       3,513
                                          ----------  ----------  ----------  ----------
  Total operating expenses                   67,452      62,218     196,488     179,487
                                          ----------  ----------  ----------  ----------

Operating income                              9,758       8,606      26,897      27,620

Interest income, net                            570         785       1,876       2,419
Foreign exchange, net                          (209)       (612)        116      (1,288)
Other income, net                               486         506         606       1,028
                                          ----------  ----------  ----------  ----------

Income before income taxes                   10,605       9,285      29,495      29,779
Provision for income taxes                    2,651       2,600       7,374       8,338
                                          ----------  ----------  ----------  ----------
Net income                                $   7,954   $   6,685   $  22,121   $  21,441
                                          ==========  ==========  ==========  ==========

Earnings per share:
  Basic                                   $    0.15   $    0.13   $    0.43   $    0.42
                                          ==========  ==========  ==========  ==========
  Diluted                                 $    0.15   $    0.13   $    0.41   $    0.40
                                          ==========  ==========  ==========  ==========

Weighted average shares outstanding:
  Basic                                      51,532      51,195      51,468      51,286
                                          ==========  ==========  ==========  ==========
  Diluted                                    53,932      52,906      53,719      53,603
                                          ==========  ==========  ==========  ==========

Dividends declared per share              $    0.05   $      --   $    0.05   $      --
                                          ==========  ==========  ==========  ==========


                                    - More -




National Instruments Reports Record Third Quarter Revenue, 19% Growth in Net
Income
Oct. 23, 2003
Page 6

                              National Instruments
                      Consolidated Statements of Cash Flows
                                 (in thousands)

                                                             Nine Months Ended
                                                               September 30,
                                                          ----------------------
                                                             2003        2002
                                                          ----------  ----------
Cash flow from operating activities:
   Net income                                             $  22,121   $  21,441
   Adjustments to reconcile net income to net cash
   provided by operating activities:
      Charges to income not requiring cash outlays:
        Depreciation and amortization                        18,787      14,862
        Benefit from deferred income taxes                     (514)     (3,769)
        Tax benefit from stock option plans                   2,565       1,164
      Changes in operating assets and liabilities:
        Increase in accounts receivable                      (5,332)     (1,894)
        Decrease (increase) in inventory                        799      (7,015)
        Decrease in prepaid expense and other assets          4,071       3,154
        (Decrease) increase in current liabilities           (4,384)      5,677
                                                          ----------  ----------
      Net cash provided by operating activities              38,113      33,620
                                                          ----------  ----------

Cash flow from investing activities:
   Payment for acquisitions, net of cash received            (5,316)         --
   Capital expenditures                                     (12,870)    (24,753)
   Capitalization of internally developed software           (9,449)     (3,025)
   Additions to other intangibles                            (1,022)     (2,214)
   Purchases of short-term investments                     (105,626)   (106,294)
   Sales/maturities of short-term investments                81,054     130,531
                                                          ----------  ----------
      Net cash used in investing activities                 (53,229)     (5,755)
                                                          ----------  ----------

Cash flow from financing activities:
   Proceeds from issuance of common stock                    11,476       6,666
   Repurchase of common stock                                    --     (17,420)
   Dividends paid                                            (2,585)         --
                                                          ----------  ----------
      Net cash provided by (used in) financing
      activities                                              8,891     (10,754)
                                                          ----------  ----------

Net increase (decrease) in cash and cash equivalents         (6,225)     17,111
Cash and cash equivalents at beginning of period             40,240      49,089
                                                          ----------  ----------

Cash and cash equivalents at end of period                $  34,015   $  66,200
                                                          ==========  ==========

Non-cash financing activities:
   Accrued liability for repurchase of common stock       $      --   $   2,203
                                                          ==========  ==========
                                            ###