UNITED STATES
              SECURITIES AND EXCHANGE COMMISSION
                    Washington, D.C.  20549


                          SCHEDULE 13G


            Under the Securities Exchange Act of 1934
                    (Amendment No. __1__)*

                  Precision Optics Corporation Inc.
      ______________________________________________________
                        (Name of Issuer)

               Common Stock, $0.01 Par Value
      ______________________________________________________
                 (Title of Class of Securities)

                         740294103
              ____________________________________
                         (CUSIP Number)

                    December 31, 2000
     -------------------------------------------------------
     (Date of Event Which Requires Filing of this Statement)


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

     --x-      Rule 13d-1(b)
     ----      Rule 13d-1(c)
     ----      Rule 13d-1(d)


*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 the disclosures provided
in a prior cover page.

The information required in 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 ("Act") 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).






CUSIP No.740294103                 13G         Page  2   of   14
----------------------------------------------------------------
(1)  NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

     Special Situations Fund III, L.P.   F13-3737427
     MGP Advisers Limited PArtnership  F13-3263120
----------------------------------------------------------------
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See
     Instructions)
  (a) | |
  (b) |X|
----------------------------------------------------------------
(3)  SEC USE ONLY
----------------------------------------------------------------
(4)  CITIZENSHIP OR PLACE OF ORGANIZATION
     Delaware/New York
----------------------------------------------------------------
 NUMBER OF     (5) SOLE VOTING POWER  See Marxe/Greenhouse
  SHARES
BENEFICIALLY    ------------------------------------------------
OWNED BY        (6) SHARED VOTING POWER             None
EACH REPORTING -------------------------------------------------
PERSON WITH:    (7) SOLE DISPOSITIVE POWER  See Marxe/Greenhouse

               ------------------------------------------------
                (8) SHARED DISPOSITIVE POWER        None
----------------------------------------------------------------
(9)  AGGREGATE AMOUNT BENEFICALLY OWNED BY EACH REPORTING PERSON

     374,300
----------------------------------------------------------------
(10) CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
     CERTAIN SHARES (See Instructions)

----------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

     3.6
----------------------------------------------------------------
(12) TYPE OF REPORTING PERSON (See Instructions)

     IV/IA
----------------------------------------------------------------










CUSIP No.740294103                 13G         Page  3   of   14
----------------------------------------------------------------
(1)  NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

     Special Situations Private Equity Fund, L.P.   F13-3916551
     MG Advisers, L.L.C. F13-3916549
----------------------------------------------------------------
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See
     Instructions)
  (a) | |
  (b) |X|
----------------------------------------------------------------
(3)  SEC USE ONLY
----------------------------------------------------------------
(4)  CITIZENSHIP OR PLACE OF ORGANIZATION
     Delaware/New York
----------------------------------------------------------------
 NUMBER OF     (5) SOLE VOTING POWER  See Marxe/Greenhouse
SHARES
BENEFICIALLY    ------------------------------------------------
OWNED BY        (6) SHARED VOTING POWER             None
EACH REPORTING -------------------------------------------------
PERSON WITH:    (7) SOLE DISPOSITIVE POWER  See Marxe/Greenhouse
               ------------------------------------------------
                (8) SHARED DISPOSITIVE POWER        None
----------------------------------------------------------------
(9)  AGGREGATE AMOUNT BENEFICALLY OWNED BY EACH REPORTING PERSON

     214,800
----------------------------------------------------------------
(10) CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
     CERTAIN SHARES (See Instructions)

----------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

     2.0
----------------------------------------------------------------
(12) TYPE OF REPORTING PERSON (See Instructions)

     IV/IA
----------------------------------------------------------------











CUSIP No. 740294103          13G             Page  4  of  14
----------------------------------------------------------------
(1)  NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

     Special Situations Technology Fund, L.P.  F13-3937585
     SST Advisers, L.L.C.           F13-3937583
----------------------------------------------------------------
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See
     Instructions)

  (a) | |
  (b) |X|
----------------------------------------------------------------
(3)  SEC USE ONLY

----------------------------------------------------------------
(4)  CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
----------------------------------------------------------------
NUMBER OF     (5) SOLE VOTING POWER   See Marxe/Greenhouse
SHARES
BENEFICIALLY    -------------------------------------------------
 OWNED BY      (6) SHARED VOTING POWER            None
   EACH        -------------------------------------------------
REPORTING      (7) SOLE DISPOSITIVE POWER  See Marxe/Greenhouse
PERSON WITH:
               -------------------------------------------------
               (8) SHARED DISPOSITIVE POWER       None
----------------------------------------------------------------
(9)  AGGREGATE AMOUNT BENEFICALLY OWNED BY EACH REPORTING PERSON

     149,000
----------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
     CERTAIN SHARES (See Instructions)

----------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

     1.4
----------------------------------------------------------------
(12) TYPE OF REPORTING PERSON*

     IV/IA
----------------------------------------------------------------







CUSIP No. 740294103          13G             Page  5  of  14
----------------------------------------------------------------
(1)  NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

     Special Situations Cayman Fund, L.P.  98-0132442
     AWM Investment Company, Inc.    11-3086452
----------------------------------------------------------------
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See
     Instructions)

  (a) | |
  (b) |X|
----------------------------------------------------------------
(3)  SEC USE ONLY

----------------------------------------------------------------
(4)  CITIZENSHIP OR PLACE OF ORGANIZATION

     Grand Cayman/Delaware
----------------------------------------------------------------
NUMBER OF     (5) SOLE VOTING POWER   See Marxe/Greenhouse
SHARES
BENEFICIALLY    -------------------------------------------------
 OWNED BY      (6) SHARED VOTING POWER            None
   EACH        -------------------------------------------------
REPORTING      (7) SOLE DISPOSITIVE POWER  See Marxe/Greenhouse
PERSON WITH:
               -------------------------------------------------
               (8) SHARED DISPOSITIVE POWER       None
----------------------------------------------------------------
(9)  AGGREGATE AMOUNT BENEFICALLY OWNED BY EACH REPORTING PERSON

     117,500
----------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
     CERTAIN SHARES (See Instructions)

----------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

     1.1
----------------------------------------------------------------
(12) TYPE OF REPORTING PERSON*

     IV/IA
----------------------------------------------------------------







CUSIP No. 740294103             13G         Page  6  of  14
----------------------------------------------------------------
(1)  NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY).

     Austin W. Marxe
     David Greenhouse
----------------------------------------------------------------
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See
     Instructions)

  (a) | |
  (b) |X|
----------------------------------------------------------------
(3)  SEC USE ONLY

----------------------------------------------------------------
(4)  CITIZENSHIP OR PLACE OF ORGANIZATION

     United States of America
----------------------------------------------------------------
 NUMBER OF     (5) SOLE VOTING POWER          855,600
  SHARES       -------------------------------------------------
BENEFICIALLY   (6) SHARED VOTING POWER      None
 OWNED BY
   EACH        -------------------------------------------------
REPORTING      (7) SOLE DISPOSITIVE POWER       855,600
PERSON WITH:   -------------------------------------------------
               (8) SHARED DISPOSITIVE POWER    None
----------------------------------------------------------------
(9)  AGGREGATE AMOUNT BENEFICALLY OWNED BY EACH REPORTING PERSON

       855,600
----------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
     CERTAIN SHARES (See Instructions)

----------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

     8.2
----------------------------------------------------------------
(12) TYPE OF REPORTING PERSON*

     IN
----------------------------------------------------------------








                                        Page 7 of 14 Pages

Item 1.
(a)  Name of Issuer:  Precision Optics Corporation Inc.
(b)  Address of Issuer's Principal Executive Offices:
     22 East Broadway, Gardner,  MA  01440-3338
Item 2.
(a)  Name of Person Filing:  This statement is filed on behalf
of (i) Special Situations Fund III, L.P., a Delaware limited
partnership ("SSF"); (ii) Special Situations Private Equity
Fund, L.P., a Delaware limited partnership (the "Private
Equity Fund"); (iii) Special Situations Technology Fund, L.P.
, a Delaware Limited Partnership (the "Technology Fund"); (iv)
Special Situations Cayman Fund, L.P., a Cayman Islands limited
partnership ("CAY"); (v)MGP Advisers Limited PArtnership, a
Delaware limited partnership,("MGP") (vi) MG Advisers L.L.C.,
a New York limited liability company, ("MG"); (vii) SST
Advisers, L.L.C., a Delaware limited liability company
("SST"); (viii) AWM Investment Company, Inc.; a Delaware
Corporation, ("AWM"); (ix) Austin W. Marxe and (x) David
Greenhouse.  Each of the foregoing is hereinafter individually
referred to as a "Reporting Person" and collectively as the
"Reporting Persons."
(b)  Address of Principal Business Office or, if none,
Residence:   The principal office and business address of the
Reporting Persons, other than CAY, is 153 East 53rd Street,
New York, New York 10022.  The principal office and business
address of Cay is c/o CIBC Bank and Trust Company (Cayman)
                                   Page 8 of 14 Pages
Limited, CIBC Bank Building, P. O. Box 694, Grand Cayman,
Cayman Islands, BWI
(c) Citizenship:  SSF, the Private Equity Fund and Technology
Fund are Delaware limited partnerships. CAY is a Cayman Island
limited partnership. MGP is a Delaware limited partnership. MG
is a New York limited liability company and SST Advisers
L.L.C. is a Delaware limited liability company.  AWM
Investment Company, Inc., is a Delaware corporation.  Austin
W. Marxe and David M. Greenhouse are United States citizens.
The business of SSF, the Private Equity Fund, the Technology
Fund and CAY is to acquire, purchase, invest in, sell, convey,
transfer, exchange and otherwise trade in principally equity
and equity related securities.  The principal business of MGP
is to act as general partner of and investment adviser to SSF.
The principal business of MG is to act as general partner of
and investment adviser to the Private Equity Fund.   The
principal business of SST is to act as general partner of and
investment adviser to the Technology Fund.  The principal
business of AWM is the act as the general partner of and
investment adviser to CAY.  In addition, AWM is the general
partner of MGP.  The principal occupation of Austin W. Marxe
and David Greenhouse is to serve as officers, directors and
members or principal shareholders of the Advisers.
2(d)      Title of Class of Securities: See cover sheets.
2(e)      CUSIP Number:  See cover sheets.
Item 3.   If this statement is filed pursuant to $240.13d-1(b)
                                   Page 9 of 14 Pages
 or 240.13d-2(b), check whether the person filing is a:
(a) ( )   Broker or Dealer registered under section 15 of the
          Act;
(b) ( )   Bank as defined in section 3(a) (6) of the Act;
(c) ( )   Insurance Company as defined in section 3(a) (19) of
          the Act;
(d) ( )   Investment Company registered under section 8 of the
          Investment Company Act of 1940;
(e) (x)   An Investment Adviser in accordance with $240.13d
          -1(b)(I)(ii)(E);
(f) ( )   An employee benefit plan or endowment fund in
          accordance with $240.13d-1(b)(I)(ii)(F);
(g) (x)   A parent holding company or control person in
          accordance with $240.13d-1(b)(1)(ii)(G);
(h) ( )   A savings association as defined in Section 3(b) of
          the Federal Deposit Insurance Act;
(i) ( )   A church plan that is excluded from the definition
          of an investment company under section 3(c)(14) of
          the Investment Company Act of 1940;
(j) ( )   Group, in accordance with $240.13d-1(b)(1)(ii)(J).
See Exhibit A attached hereto.
Item 4.   Ownership:
(a)  Amount Beneficially Owned:   855,600 shares of Common
     Stock are beneficially owned by Austin W. Marxe and David
     Greenhouse; of which 374,300 shares of common stock are
     owned by SSF, 214,800 shares of common stock are owned by
                                   Page 10 of 14 Pages
     the Private Equity Fund, 149,000 shares of common stock
     are owned by the Technology Fund and 117,500 shares of
     common stock are owned by CAY.
(b)  Percent of Class:  8.2 percent of the Common Stock are
     beneficially owned by Austin Marxe and David Greenhouse.
     3.6 percent are owned by SSF, 2.0 percent are owned by
     the Private Equity Fund, 1.4 percent are beneficially
     owned by the Technology Fund, and 1.1 percent are
     beneficially owned by CAY.
(c)  Number of Shares as to which the person has Rights to
      Vote and/or Dispose of Securities:  SSF, MGP, The
     Private Equity Fund, MG Adviser L.L.C , the Technolgy
     Fund, SST Advisers L.L.C., CAY and AWM have sole power to
     vote or to direct the vote and to dispose or to direct
     the disposition of all securities reported hereby which
     are respectively beneficially owned by each Fund and its
     Adviser.
     Austin Marxe and David Greenhouse have shared power to
     vote or to direct the vote of and to dispose or to direct
     the disposition of securities reported hereby which are
     beneficially owned by Austin Marxe and David Greenhouse
     by virtue of being Executive Officers of the Investment
     Advisers.
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
                              Page 11 of 14 Pages
     beneficial owner of more that five percent of the class
     of securities, check the following     .
     Item 6.Ownership of More than Five Percent on Behalf of
     Another Person:  SSF, The Private Equity Fund, the
     Technology Fund and CAY as owners of the securities in
     question, have the right to receive any dividends from,
     or proceeds from the sale of, such securities.
Item 7. Identification and Classification of the Subsidiary
     Which Acquired the Security being Reported on By the
     Parent Holding Company:  See Exhibit A attached hereto.
Item 8. Identification and Classification of Members of the
      Group:  Not applicable
Item 9. Notices of Dissolution of Group:  Not applicable.
Item 10.  Certification:
               By signing below I certify that, to the best of
my knowledge and belief, the securities referred to above were
acquired and are held in the ordinary course of business and
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.




                                   Page 12 of 14 Pages

                          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: February 12, 2001


               SPECIAL SITUATIONS FUND III, L.P.


               By:/s/ Austin W. Marxe
                  Austin W. Marxe
                  Managing Director

               MGP ADVISERS LIMITED PARTNERSHIP


               By:/s/ Austin W. Marxe
                   Austin W. Marxe
                   Chief Executive Officer

               SPECIAL SITUATIONS PRIVATE EQUITY FUND, L.P.


               By:/s/ Austin W. Marxe
                  Austin W. Marxe
                  Managing Director

               MG ADVISERS L.L.C.


               By:/s/ Austin W. Marxe
                   Austin W. Marxe
                   President and Chief Executive Officer

               SPECIAL SITUATIONS TECHNOLOGY FUND, L.P.



               By: /s/ Austin W. Marxe
                   Austin W. Marxe
                   Managing Director



                                   Page 13 of 14 Pages

                    SST ADVISERS L.L.C



               By: /s/ Austin W. Marxe
                   Austin W. Marxe
                   President and CEO


               SPECIAL SITUATIONS CAYMAN FUND, L.P.



               By: /s/ Austin W. Marxe
                   Austin W. Marxe
                   Managing Director


                    AWM INVESTMENT COMPANY, INC.



               By: /s/ Austin W. Marxe
                   Austin W. Marxe
                   President and CEO



                    /s/ Austin W. Marxe
                    AUSTIN W. MARXE



                    /s/David M Greenhouse
                    DAVID GREENHOUSE


















                                   Page 14 of 14 Pages





                          EXHIBIT A


     This Exhibit explains the relationship between the
Reporting Persons.  MGP Advisers Limited Partnership (MGP), a
Delaware limited partnership, is the general partner of the
Special Situations Fund III, L.P., a Delaware limited
partnership.  MG Advisers L.L.C. (MG), a New York limited
liability company, is the general partner of the Special
Situations Private Equity Fund, l.P., a Delaware Limited
Partnership.  SST Advisers L.L.C., A Delaware limited
liability company (SST) is the general partner of the Special
Situations Technology Fund, L.P., a Delaware Limited
Partnership.  AWM Investment Company, Inc., a Delaware
corporation (AWM) is the general partner of the Special
Situations Cayman Fund, L.P., a Cayman Islands limited
partnership as well as the general partner of MGO.  Austin W.
Marxe and David M. Greenhouse are the principal owners of MGP,
MG and SST and are principally responsible for the selection,
acquisition and disposition of the portfolios securities by
the investment advisers on behalf of their Fund.