EXHIBIT 8.2

January 21, 1997
    



Knogo North America Inc.
350 Wireless Boulevard
Hauppauge, New York 11788-3907

Re:      Sentry Technology Corporation
         Registration Statement on Form S-4

Ladies and Gentlemen:

   
We have acted as counsel for Knogo North  America  Inc., a Delaware  corporation
(the  "Corporation"),  in  connection  with the  preparation  and  filing of the
Registration Statement of Sentry Technology Corporation,  a Delaware corporation
("Sentry"),  on Form S-4 (the "Registration Statement") under the Securities Act
of 1933, as amended (the "Securities  Act"),  covering shares of Sentry's Common
Stock, par value $0.001 per share, and of its Class A Preferred Stock, par value
$0.001 per share. Any capitalized terms not defined herein will have the meaning
ascribed to them in the Registration Statement.

We have reviewed the following documents:  (i) the Registration Statement;  (ii)
the Amended and Restated  Agreement and Plan of Reorganization  and Merger among
the Corporation,  Sentry , Video Sentry  Corporation,  a Minnesota  corporation,
Viking Merger Corp., a Minnesota  corporation and Strip Merger Corp., a Delaware
corporation,  dated as of November  27,  1996 (the  "Merger  Agreement");  (iii)
Amendment No. 1 to the Merger Agreement among the parties  thereto,  dated as of
January 10, 1997; and (iv) such other  documents as we have deemed  necessary or
relevant for the purposed of this opinion.  As to the various  questions of fact
material  to this  opinion,  we have  relied upon  statements  of  officers  and
representatives  of the  Corporation  and  others.  We have also  examined  such
matters of law as we have deemed  necessary or  appropriate  for the purposes of
this opinion.  We note that our opinion is based on our examination of such law,
our review of the documents described above, statements and assumptions referred
to above and in the Joint  Proxy  Statement/Prospectus  included  as part of the
Registration  Statement  (the  "Prospectus"),  the  provisions  of the  Internal
Revenue Code of



Knogo North America Inc.
January 21, 1997
Page 2


1986, as amended (the "Code"), the regulations and published rulings thereunder,
and the  judicial  interpretation  thereof  currently  in effect.  Any change in
applicable law or any of the facts and circumstances described in the Prospectus
or inaccuracy of any  statements or  assumptions,  on which we have relied,  may
affect the continuing validity of our opinion.

For the  purposes of this  opinion,  we have  assumed  (i) the  Mergers  will be
consummated in the manner  contemplated in the Prospectus and in accordance with
the  provisions of the Merger  Agreement,  (ii) the  statements  concerning  the
Mergers set forth in the  Prospectus  are accurate and  complete,  (iii) we will
delivers  an opinion  (the  "Opinion")  to you on the Closing  Date,  based upon
reasonably requested representation letters, to the effect that the Knogo Merger
will be treated  for  Federal  income tax  purposed as a transfer of property to
Sentry by holders of Knogo Common Stock  governed by Section 351 of the Code and
(iv) the Knogo  Merger  will be  treated  for  Federal  income tax  purposes  in
accordance with the Opinion.

Attorneys  involved in the  preparation of this opinion are admitted to practice
law in the  State of New York and we do not  purport  to be  experts  on,  or to
express any opinion herein concerning,  any law other than the laws of the State
of New York,  the Federal  laws of the United  States of America and the General
Corporation  Law of the State of Delaware.
    

Subject to the caveats and  conditions  set forth above,  it is our opinion that
the  discussion of the Federal  income tax  consequences  to certain  holders of
Knogo Common Stock set forth in the  Prospectus  under the caption "THE MERGER -
Certain  Federal Income Tax  Consequences - Treatment of Holders of Knogo Common
Stock - Exchange of Knogo Common stock for Sentry  Common Stock and Sentry Class
A Preferred Stock" and "-Cash in Lieu of Fractional Shares" accurately describes
the  Federal  income  tax  consequences  described  therein.  We note  that such
discussion does not include a complete  analysis of all tax  consequences of the
Knogo Merger and in particular does not address tax  consequences  that may vary
with,  or are  contingent  on,  individual  circumstances.  No  rulings  will be
obtained from the Internal  Revenue  Service with respect to the Federal  income
tax consequences of the Knogo Merger.  Thus, there can be no assurances that the
Internal  Revenue Service would not take a position in conflict with our opinion
herein and that such position might not ultimately be sustained by the courts.

We  hereby  consent  to  the  filing  of  this  opinion  as an  exhibit  to the
Registration  Statement  and to the  references  to this firm under the  caption
"Certain  Federal Income Tax  Consequences" in the Prospectus which forms a part
of the Registration  Statement.  In giving such consent,  we do not admit hereby
that we come within the  category  of persons  whose  consent is required  under
Section 7 of the Securities  Act or the Rules and  Regulations of the Commission
thereunder.

Very truly yours,

/s/ STROOCK & STROOCK & LAVAN