<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>electro13g.txt
<TEXT>

                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                            -------------------------

                                  SCHEDULE 13G
                                 (Rule 13d-102)

                    INFORMATION TO BE INCLUDED IN STATEMENTS
                  FILED PURSUANT TO RULES 13d-1(b), (c) AND (d)
                AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(b)
                         (Amendment No. ______1______)1

                              Electro Sensors, Inc.

                                (Name of Issuer)

                                     Common
                         (Title of Class of Securities)

                                   285233 10 3
--------------------------------------------------------------------------------
                                 (CUSIP Number)

                                December 31, 2004

             (Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

                   / /   Rule 13d-1(b)
                   /X/   Rule 13d-1(c)
                  / /    Rule 13d-1(d)


-----------------------------
1    The  remainder  of this  cover  page  shall be filled  out for a  reporting
     person's  initial  filing on this form with respect to the subject class of
     securities,  and for any subsequent amendment containing  information which
     would alter disclosures provided in a prior cover page.

     The  information  required on the remainder of this cover page shall not be
     deemed to be  "filed"  for the  purpose  of  Section  18 of the  Securities
     Exchange  Act of 1934  or  otherwise  subject  to the  liabilities  of that
     section of the Act but shall be subject to all other  provisions of the Act
     (however, see the Notes).


<PAGE>


<TABLE>
<CAPTION>

<S>                                                                                                         <C>

--------------------------------------------------------------------------------------------------------------------
        NAME OF REPORTING PERSONS: Daniel Zeff
        I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
--------------------------------------------------------------------------------------------------------------------
        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                                        (a)     0
                                                                                        (b)
--------------------------------------------------------------------------------------------------------------------
        SEC USE ONLY

--------------------------------------------------------------------------------------------------------------------
        CITIZENSHIP OR PLACE OF ORGANIZATION        United States of America

--------------------------------------------------------------------------------------------------------------------
      NUMBER OF           SOLE VOTING POWER                                                                 246,499
      SHARES
   BENEFICIALLY
     OWNED BY
       EACH
     REPORTING
    PERSON WITH
--------------------------------------------------------------------------------------------------------------------
                          SHARED VOTING POWER                                                                     0

--------------------------------------------------------------------------------------------------------------------
                          SOLE DISPOSITIVE POWER                                                            246,499

--------------------------------------------------------------------------------------------------------------------
                          SHARED DISPOSITIVE POWER                                                                0

--------------------------------------------------------------------------------------------------------------------
        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                        246,499

--------------------------------------------------------------------------------------------------------------------
        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
        CERTAIN SHARES*
--------------------------------------------------------------------------------------------------------------------
        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                                                     7.66%

--------------------------------------------------------------------------------------------------------------------
        TYPE OF REPORTING PERSON*                                                                                IN

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

                      *SEE INSTRUCTION BEFORE FILLING OUT!


</TABLE>



                                      -2-
<PAGE>





Item 1(a).        Name of Issuer:

                           Electro Sensors Inc

Item 1(b).        Address of Issuer's Principal Executive Offices:

                           6111 BLUE CIRCLE DR
                           Minnetonka, MN 55343-9108

Item 2(a).        Name of Person Filing:

                           Daniel Zeff
                           (the "Reporting Person")

Item 2(b).        Address of Principal Business Office or, if None, Residence:

                           The principal business address of the Reporting
Person is:

                           c/o Zeff Holding Company, LLC
                           50 California Street, Suite 1500
                           San Francisco, CA 94111


Item 2(c).        Citizenship:

                           Mr. Zeff is a United States citizen.

Item 2(d).        Title of Class of Securities:

                           Common Stock, par value $.10

Item 2(e).        CUSIP Number: 285233 10 3





                                      -3-
<PAGE>



Item 3.  If this statement is filed pursuant to Rule 13d-1(b), or 13d-2(b) or
         (c), check whether the person filing is a:      Not Applicable

     (a)  [ ] Broker or dealer registered under Section 15 of the Exchange Act;

     (b)  [ ] Bank as defined in Section 3(a)(6) of the Exchange Act;

     (c)  [ ] Insurance  Company as defined in Section  3(a)(19) of the Exchange
              Act;

     (d)  [ ] Investment  Company  registered  under Section 8 of the Investment
              Company Exchange Act;

     (e)  [ ] Investment Adviser in accordance with Rule 13d-1(b)(1)(ii)(E);

     (f)  [ ] Employee  Benefit Plan or Endowment  Fund in accordance  with Rule
              13d-1(b)(1)(ii)(F);

     (g)  [ ] Parent Holding  Company or Control Person in accordance  with Rule
              13d-1(b)(1)(ii)(G);

     (h)  [ ] Saving  Association  as  defined in  Section  3(b) of The  Federal
              Deposit Insurance Act;

     (i)  [ ] Church Plan that is excluded from the  definition of an Investment
              Company under Section 3(c)(14) of the Investment Company Act;

     (j)  [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

<TABLE>
<CAPTION>

<S>                                                                                           <C>

Item 4.           Ownership.

                  A.  Daniel Zeff

                  (a)  Amount beneficially owned:                                             246,499
                  (b)  Percent of Class:                                                         7.66%
                  (c)   Number of shares as to which such person has:

                      (i)  Sole power to vote or direct the vote:                             246,499
                      (ii) Shared power to vote or to direct the vote:                              0
                      (iii)Sole power to dispose or direct the disposition of:                246,499
                      (iv) Shared power to dispose or to direct the disposition of:                 0
                           As calculated in accordance with Rule 13d-3 of the
                           Securities Exchange Act of 1934, as amended, Daniel
                           Zeff beneficially owns 246,499 shares of the Issuer's
                           Common Stock, par value $0.10 ("Common Stock"),
                           representing 7.66% of the Common Stock. Mr. Zeff does
                           not directly own any shares of Common Stock, but he
                           indirectly owns 246,499 shares of Common Stock

</TABLE>


                                      -4-
<PAGE>


                           in his capacity as the sole manager and member of
                           Zeff Holding Company, LLC a Delaware limited
                           liability company ("ZHC") which in turn serves as the
                           general partner for Zeff Capital Partners I, L.P.
                           ("ZCP"), a Delaware Limited Partnership. Mr. Zeff
                           also provides discretionary investment management
                           services to Zeff Capital Offshore Fund ("ZCF"), a
                           class of shares of Spectrum Galaxy Fund Ltd., a
                           company incorporated in the British Virgin Islands.


Item 5.           Ownership of Five Percent or Less of a Class.

                           If this statement is being filed to report the fact
                           that as of the date hereof the reporting person has
                           ceased to be the beneficial owner of more than five
                           percent of the class of securities, check the
                           following: [ ]

Item 6.           Ownership of More than Five Percent on Behalf of Another
                  Person.

                           Each of ZCP and ZCF have the right to receive and the
                           power to direct the receipt of dividends from, and
                           the proceeds from the sale of, the shares of Common
                           Stock held by them.

Item 7.           Identification and Classification of the Subsidiary Which
                  Acquired the Security Being Reported on by the Parent
                  Holding Company.

                           Not Applicable

Item 8.           Identification and Classification of Members of the Group.

                           Not Applicable

Item 9.           Notice of Dissolution of Group.

                           Not Applicable



                                      -5-
<PAGE>



Item 10. Certification.

         By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were not acquired and are not held for
the purpose of or with the effect of changing or influencing the control of the
issuer of the securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose or effect.

                                    SIGNATURE


         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  January 10, 2005

                                                        /s/ Daniel Zeff
                                                        ---------------
                                                            Daniel Zeff





         Attention: Intentional misstatements or omissions of fact constitute
Federal criminal violations (see 18 U.S.C. 1001).






                                      -6-
<PAGE>



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