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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=4><B>UNITED STATES
<BR>
SECURITIES AND EXCHANGE COMMISSION</B></FONT>
<BR>
<FONT FACE="Times New Roman, Times, Serif" SIZE=2>Washington, D.C. 20549</FONT></P>

<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=4>FORM 8-K </FONT></H1>

<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE="3"><B>CURRENT REPORT
<BR></B> </FONT>
<FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>Pursuant to Section 13 or 15(d)
<BR>
of the Securities Exchange Act of 1934</B> </FONT>
<BR><BR>
<FONT FACE="Times New Roman, Times, Serif" SIZE="2">Date of Report (Date of earliest event reported): July 17, 2003 </FONT>
</P>

<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE="5"><B>MOLECULAR DEVICES CORPORATION</B> </FONT>
<BR>
<FONT FACE="Times New Roman, Times, Serif" SIZE="2">(Exact name of registrant as specified in its charter) </FONT>
<BR>
<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>Delaware</B></FONT>
<BR>
(State or other jurisdiction of incorporation)</P>




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     <TD WIDTH="50%" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>0-27316</B> </FONT></TD>
     <TD WIDTH="50%" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>94-2914362</B> </FONT></TD></TR>
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     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">(Commission File Number) </FONT></TD>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">(IRS Employer Identification No.) </FONT></TD></TR>
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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>1311 Orleans Drive
<BR>
Sunnyvale, CA 94089</B>
<BR>
(Address of Principal Executive Offices, including Zip Code)
<BR><BR>
Registrant&#146;s telephone number, including area code: (408) 747-1700
<BR>
_________________ </FONT></P>



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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>Item&nbsp;9.&nbsp;&nbsp;&nbsp;&nbsp;
     Regulation&nbsp;FD Disclosure (Information Furnished in this Item is Being
     Furnished Under Items 9 and 12).</B> </FONT></P>

<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>In accordance with SEC Release
No.&nbsp;33-8216, the information contained herein and in the accompanying exhibit is
being furnished under both Item&nbsp;9 and Item 12. </FONT></P>

<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>On July 17, 2003, Molecular Devices
Corporation (&#147;Molecular Devices&#148;) reported its fiscal second quarter results for
the period ending June 30, 2003. A copy of the press release issued by Molecular Devices
on July 17, 2003 concerning the foregoing results is furnished herewith as
Exhibit&nbsp;99.1 and is incorporated herein by reference. </FONT></P>

<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>The information in this report,
including the exhibit hereto, shall not be deemed to be &#147;filed&#148; for purposes of
Section&nbsp;18 of the Securities Exchange Act of 1934, as amended, or otherwise subject
to the liabilities of that Section or Sections&nbsp;11 and 12(a)(2) of the Securities Act
of 1933, as amended. The information contained herein and in the accompanying exhibit
shall not be incorporated by reference into any filing with the U.S. Securities and
Exchange Commission made by Molecular Devices, whether made before or after the date
hereof, regardless of any general incorporation language in such filing. </FONT></P>

<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>The information furnished in this
report, including the exhibit hereto, shall not be deemed to constitute an admission that
such information or exhibit is required to be furnished by Regulation&nbsp;FD or that the
information or exhibit in this report contains material information that is not otherwise
publicly available. </FONT></P>


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<A NAME=A018></A>
<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>SIGNATURE </FONT></H1>

<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused
this report to be signed on its behalf by the undersigned, thereunto duly authorized. </FONT></P>


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     <TD WIDTH=42% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD WIDTH=8% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD WIDTH=50% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>MOLECULAR DEVICES CORPORATION</B></FONT></TD></TR>
<TR>
     <TD ALIGN=RIGHT>&nbsp;</TD>
     <TD ALIGN=RIGHT>&nbsp;</TD>
     <TD ALIGN=RIGHT>&nbsp;</TD></TR>
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     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Dated: July 17, 2003</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>By:&nbsp;&nbsp;&nbsp;&nbsp;/s/ Timothy A. Harkness</FONT></TD></TR>
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     <TD ALIGN=RIGHT><HR NOSHADE COLOR=Black SIZE=1></TD></TR>
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     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Timothy A. Harkness</FONT></TD></TR>
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     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Vice President and Chief</FONT></TD></TR>
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     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Financial Officer</FONT></TD></TR>
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<A NAME=A019></A>
<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>INDEX TO EXHIBITS </FONT></H1>

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<TD WIDTH="2%"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>99.1</FONT></TD>
<TD WIDTH="2%"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;</FONT></TD>
<TD WIDTH="96%"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
Press release, dated as of July 17, 2003, reporting Molecular Devices
Corporation&#146;s fiscal second quarter results for the period ended June 30, 2003
(furnished and not filed herewith solely pursuant to Item&nbsp;9 and Item&nbsp;12). </FONT></TD>
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d)
of the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported): July 17, 2003
MOLECULAR DEVICES CORPORATION
(Exact name of registrant as specified in its charter)
Delaware
(State or other jurisdiction of incorporation)
0-27316
94-2914362
(Commission File Number)
(IRS Employer Identification No.)
1311 Orleans Drive
Sunnyvale, CA 94089
(Address of Principal Executive Offices, including Zip Code)
Registrant's telephone number, including area code: (408) 747-1700
_________________
Item 9.    
     Regulation FD Disclosure (Information Furnished in this Item is Being
     Furnished Under Items 9 and 12).
In accordance with SEC Release
No. 33-8216, the information contained herein and in the accompanying exhibit is
being furnished under both Item 9 and Item 12.
On July 17, 2003, Molecular Devices
Corporation ("Molecular Devices") reported its fiscal second quarter results for
the period ending June 30, 2003. A copy of the press release issued by Molecular Devices
on July 17, 2003 concerning the foregoing results is furnished herewith as
Exhibit 99.1 and is incorporated herein by reference.
The information in this report,
including the exhibit hereto, shall not be deemed to be "filed" for purposes of
Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject
to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act
of 1933, as amended. The information contained herein and in the accompanying exhibit
shall not be incorporated by reference into any filing with the U.S. Securities and
Exchange Commission made by Molecular Devices, whether made before or after the date
hereof, regardless of any general incorporation language in such filing.
The information furnished in this
report, including the exhibit hereto, shall not be deemed to constitute an admission that
such information or exhibit is required to be furnished by Regulation FD or that the
information or exhibit in this report contains material information that is not otherwise
publicly available.
SIGNATURE
Pursuant
to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused
this report to be signed on its behalf by the undersigned, thereunto duly authorized.
MOLECULAR DEVICES CORPORATION
Dated: July 17, 2003
By:    /s/ Timothy A. Harkness
Timothy A. Harkness
Vice President and Chief
Financial Officer
INDEX TO EXHIBITS
99.1
Press release, dated as of July 17, 2003, reporting Molecular Devices
Corporation's fiscal second quarter results for the period ended June 30, 2003
(furnished and not filed herewith solely pursuant to Item 9 and Item 12).