Filed by Nanometrics Incorporated Pursuant to Rule 425
                                                Under the Securities Act of 1933
                                        And Deemed Filed Pursuant to Rule 14a-12
                                       Under the Securities Exchange Act of 1934
                                  Subject Company: August Technology Corporation
                                                  Commission File No.: 000-30637

         This  filing  relates  to  a  planned  merger  (the  "Merger")  between
Nanometrics  Incorporated  ("Nanometrics")  and  August  Technology  Corporation
("August")  pursuant  to the  Agreement  and Plan of Merger and  Reorganization,
dated  January  21,  2005,  by  and  among  Nanometrics,   Major  League  Merger
Corporation  (a  wholly-owned  subsidiary of  Nanometrics),  Minor League Merger
Corporation  (also a  wholly-owned  subsidiary of  Nanometrics)  and August (the
"Merger  Agreement").  

         On March 22, 2005, the Chief Executive Officer of Nanometrics  mailed a
letter to  certain  Nanometrics'  customers  addressing  certain  aspects of the
Merger. The text of the letter is set forth below.

--------------------------------------------------------------------------------

Dear Valued Customer,


         August Technology and Nanometrics,  Inc.  announced last month our plan
to merge in order to create a stronger, more customer-focused provider of global
metrology and inspection  solutions.  Both August and Nanometrics  have affirmed
our intentions to continue with the merger plan.

         Why is this merger so important?

         We believe the August-Nanometrics  merger is good for the semiconductor
industry and our customers. A combined  August-Nanometrics will provide an array
of front-end and final  manufacturing  inspection  and metrology  equipment that
will offer better alternatives. That means more choices for you. We believe that
keeping  alive a competitive  environment  in metrology is good for the industry
and good for you, our valued customer.

         The benefits of competition  are numerous:  A competitive  market keeps
everyone on their toes, keeps innovation alive, keeps customer service front and
center,  and keeps costs from escalating out of control.  From our  competitor's
perspective,   competition   will  hinder  their  ability  to  unduly  influence
technology roadmaps and maintain their grip on pricing.

         If you believe more  competition is in the industry's  best  interests,
please  join  us in  insuring  the  successful,  unhindered  completion  of  the
August-Nanometrics  merger.  We  believe  in the  power of the  market to decide
what's rational and right. If you are concerned about larger companies gaining a
potential chokehold on the metrology and inspection  business,  take action now.
Use the  power of your PO's to send a  message.  Use the power of the pen to let
management and the media know of your concerns.  Use the power of the proxy,  by
instructing  your  investment  group to acquire shares of August  Technology and
voting down the other bid.

         Additionally,  the  challenges  to small,  innovative  providers in our
industry  have never been  greater.  While often  producing  the best new ideas,
small and mid-sized  companies in the capital equipment industry today work very
hard  to  serve  your   increasingly   global   needs,   to  meet  their  fiscal
responsibilities as public companies  (particularly under Sarbanes-Oxley) and to
reinvest in leading edge R&D that can move technology  forward.  In these times,
smart combinations like the August-Nanometrics merger can produce the technical,
financial and infrastructure critical mass needed to serve you better.

         Much is at stake in this  effort,  not merely the joining of two small,
spirited companies.  At risk is the guarantee of an open arena of new ideas, for
breakthroughs  like  integrated  metrology,  Optical  Critical  Dimension  (OCD)
metrology,  advanced machine vision macro inspection and the future of important
business issues, like metrology cost escalation.

         Please  join me in  working  to  preserve  more,  not fewer  choices in
meeting your future metrology needs.


Sincerely,

John Heaton
CEO
Nanometrics Incorporated


Cautionary  Statement  for the  Purpose  of the Safe  Harbor  Provisions  of the
Private Securities Litigation Reform Act of 1995

         This letter contains  forward-looking  statements within the meaning of
the safe harbor  provisions of the Private  Securities  Litigation Reform Act of
1995. In some cases,  forward-looking statements can be identified by words such
as "believe," "expect," "anticipate," "plan," "potential," "continue" or similar
expressions.  Forward-looking statements also include the assumptions underlying
or relating to any of the foregoing statements.  Such forward-looking statements
are based upon current  expectations  and beliefs and are subject to a number of
factors and  uncertainties  that could cause actual results to differ materially
from those  described in the  forward-looking  statements.  The  forward-looking
statements  contained in this letter include  statements  about future financial
and  operating  results  and  the  proposed   Nanometrics/August  merger.  These
statements  are not  guarantees of future  performance,  involve  certain risks,
uncertainties and assumptions that are difficult to predict,  and are based upon
assumptions as to future events that may not prove accurate.  Therefore,  actual
outcomes and results may differ  materially from what is expressed  herein.  For
example,  if either of the companies  does not receive  required  shareholder or
governmental  approvals or fails to satisfy  other  conditions  to closing,  the
transaction will not be consummated.  In any forward-looking  statement in which
Nanometrics  expresses  an  expectation  or belief as to  future  results,  such
expectation  or  belief  is  expressed  in good  faith  and  believed  to have a
reasonable  basis,  but  there  can  be  no  assurance  that  the  statement  or
expectation or belief will result or be achieved or accomplished.  The following
factors,  among others,  could cause actual  results to differ  materially  from
those described in the forward-looking statements: the risk that the Nanometrics
and August businesses will not be integrated successfully;  costs related to the
proposed  merger;  failure of the Nanometrics or August  shareholders to approve
the proposed merger, and other economic, business, competitive and/or regulatory
factors  affecting  Nanometrics' and August's  businesses  generally,  including
those set forth in  Nanometrics'  and August's  filings with the SEC,  including
their Annual Reports on Form 10-K for their respective most recent fiscal years,
especially  in the  Management's  Discussion  and Analysis  section,  their most
recent Quarterly Reports on Form 10-Q and their Current Reports on Form 8-K. All
forward-looking  statements  included  in this  letter are based on  information
available  to  Nanometrics  on  the  date  hereof.   Nanometrics  undertakes  no
obligation   (and   expressly   disclaims   any  such   obligation)   to  update
forward-looking   statements   made  in  this   letter  to  reflect   events  or
circumstances  after the date of this  letter or to update  reasons  why  actual
results could differ from those anticipated in such forward-looking statements.

Additional Information and Where to Find It

         Nanometrics  Incorporated,  August  Technology  Corporation  and  Minor
League Merger Corporation (which will be renamed by Nanometrics Incorporated and
August Technology  Corporation in connection with the proposed merger) intend to
file  a  joint  proxy   statement/prospectus   in  connection  with  the  merger
transaction involving Nanometrics Incorporated,  Major League Merger Corporation
(a subsidiary of  Nanometrics  formed in connection  with the proposed  merger),
Minor League Merger Corporation and August Technology Corporation. Investors and
security  holders  are  urged  to  read  the  joint  proxy  statement/prospectus
regarding the proposed merger when it becomes  available because it will contain
important    information    about   the    transaction.    The    joint    proxy
statement/prospectus  will be filed with the Securities and Exchange  Commission
by  Nanometrics  Incorporated  and August  Technology  Corporation  and security
holders may obtain a free copy of the joint proxy  statement/prospectus (when it
is available) and other documents filed by Nanometrics  Incorporated  and August
Technology  Corporation  with the  Securities  and  Exchange  Commission  at the
Securities and Exchange  Commission's  web site at www.sec.gov.  The joint proxy
statement/prospectus  and these other  documents  may also be obtained  for free
from  Nanometrics   Incorporated  or  August  Technology   Corporation  investor
relations at investors@nanometrics.com and invest@augusttech.com, respectively.

         Nanometrics  Incorporated and its executive  officers and directors may
be  deemed  to  be  participants  in  the   solicitation  of  proxies  from  the
stockholders of August Technology Corporation and Nanometrics  Incorporated with
respect to the transactions  contemplated by the merger  agreement.  Information
regarding such officers and directors is included in Nanometrics  Incorporated's
Proxy  Statement  for its 2003  Annual  Meeting of  Stockholders  filed with the
Securities  and  Exchange  Commission  on August  23,  2004.  This  document  is
available free of charge at the Securities and Exchange Commission's web site at
www.sec.gov   and  from   Nanometrics   Incorporated   investor   relations   at
investors@nanometrics.com.