SUMMARY OF RIGHTS TO PURCHASE PREFERRED STOCK

Dividend of Right to Purchase Preferred Stock

As of December  30,1997,  the Board of  Directors  of PSC Inc.  (the  "Company")
declared a dividend of one preferred  share  purchase right (a "Right") for each
outstanding  share of common  stock,  par  value  $.01 per  share  (the  "Common
Shares"),  of the Company to  shareholders of record at the close of business on
December  30,  1997  (the  "Record  Date")  and for  each  Common  Share  issued
(including shares  distributed from Treasury by the Company thereafter and prior
to the Distribution Date (as defined below)). Each Right entitles the registered
holder,  subject to the terms of the Rights  Agreement  (as defined  below),  to
purchase from the Company one  one-thousandth  of a share (a "Unit") of Series B
Preferred Stock, par value $.01 per share (the "Preferred  Stock") at a purchase
price of $45.00 per Unit (the  "Purchase  Price"),  subject to  adjustment.  The
Purchase  Price is payable in cash or by certified or bank check  payable to the
order of the Company or by wire transfer to the account of the Company (provided
a notice of such wire  transfer is given by the holder of the  related  Right to
the Rights Agent).  The  description  and terms of the Rights are set forth in a
Rights Agreement (the "Rights  Agreement")  between the Company and Chase Mellon
Shareholder Services, L.L.C., as Rights Agent (the "Rights Agent").

Distribution of the Rights; Right Certificates

Until the Distribution Date (or earlier redemption or expiration of the Rights),
which is defined below,  the Rights will be evidenced with respect to any of the
Common Share  certificates  outstanding  prior to the Distribution  Date by such
Common  Share   certificates  and  no  separate  Right   Certificates   will  be
distributed.  The Rights Agreement provides that until the Distribution Date (or
earlier  redemption  or  expiration  of the  Rights),  (i)  the  Rights  will be
transferred  with and only  with  the  Common  Shares,  (ii)  new  Common  Share
certificates  issued after the Record Date,  upon  transfer,  replacement or new
issuance  of Common  Shares  will be deemed to be issued  with  Rights  and will
contain a notation  incorporating  the Rights Agreement by reference,  and (iii)
the surrender for transfer of any certificates for Common Shares, outstanding as
of the Record  Date,  even  without  such  notation or a copy of this Summary of
Rights being attached  thereto,  will also constitute the transfer of the Rights
associated with the Common Shares represented by such certificate.

As soon as practicable  following the Distribution Date,  separate  certificates
evidencing the Rights ("Right Certificates") will be mailed to holders of record
of the Common Shares as of the close of business on the Distribution  Date. From
and after the  Distribution  Date, such separate Right  Certificates  alone will
evidence the Rights.






Definition of Distribution Date

"Distribution Date" means the earlier to occur of (i) 10 business days following
the date of a public  announcement  (the  date of such  announcement  being  the
"Shares  Acquisition  Date") that a person,  together with persons affiliated or
associated with it (other than the Company,  any subsidiary of the Company,  any
employee  benefit  plan  of the  Company  or  such  subsidiary)  (an  "Acquiring
Person"),  has  acquired  beneficial  ownership  of 20%  or  more  of  the  then
outstanding Common Shares of the Company or (ii) 10 business days (or such later
date as may be determined by action of the Board of Directors prior to such time
as any  person or group of  affiliated  persons  becomes  an  Acquiring  Person)
following the earlier of the commencement  of, or the first public  announcement
of the intent to commence,  a tender  offer or exchange  offer by a person other
than the Company if, upon consummation of the offer, such person,  together with
persons  affiliated or associated with it, would be the beneficial  owner of 20%
or more of the outstanding Common Shares.

Exercise and Expiration of the Rights

The Rights are not  exercisable  until the  Distribution  Date.  The Rights will
expire at the close of  business on  December  30,  2007 (the "Final  Expiration
Date"), unless earlier redeemed or exchanged by the Company as described below.

Adjustment of the Purchase Price

The Purchase Price payable, and the number of Units of Preferred Stock issuable,
upon  exercise  of the Rights are  subject  to  adjustment  from time to time to
prevent  dilution  (i) in the event of a stock  dividend  on, or a  subdivision,
combination or reclassification  of, the Preferred Stock, (ii) upon the grant to
holders of the Preferred Stock of certain rights or warrants to subscribe for or
purchase  Preferred Stock at a price, or securities  convertible  into Preferred
Stock with a conversion  price,  less than the then current  market price of the
Preferred Stock or (iii) upon the distribution to holders of the Preferred Stock
of evidences of indebtedness,  cash or assets (excluding  regular quarterly cash
dividends or dividends payable in Preferred Stock) or of subscription  rights or
warrants  (other than those  referred to above).  With  certain  exceptions,  no
adjustment in the Purchase Price will be required until  cumulative  adjustments
require an adjustment of at least 1% in the Purchase  Price.  The Company is not
required to issue fractional Units. In lieu thereof an adjustment in cash may be
made based on the market value of a Unit of Preferred  Stock on the last trading
day prior to the date of exercise.

The number of outstanding  Rights are also subject to adjustment in the event of
a stock split of the Common  Shares or a stock  dividend  on the Common  Shares,
payable in Common Shares or subdivisions,  consolidations or combinations of the
Common Shares occurring, in any such case, prior to the Distribution Date.


Effects of Certain Events

In the event that a person,  together with persons affiliated or associated with
it,  becomes an  Acquiring  Person,  each holder of a Right,  except as provided
below, will thereafter have the right to receive,  upon exercise thereof,  Units
of Preferred  Stock having a value equal to two times the exercise  price of the
Right.  The exercise  price is the Purchase  Price  multiplied  by the number of
Units of Preferred  Stock  issuable  upon exercise of a Right prior to the event
set forth in the preceding sentence.  Notwithstanding  the foregoing,  following
the occurrence of the event set forth in the first  sentence in this  paragraph,
all Rights that are,  or (under  certain  circumstances  set forth in the Rights
Agreement)  were,  beneficially  owned by any  Acquiring  Person  (or by certain
related parties and transferees) will be null and void.

For example,  at an exercise price of $45 per Right,  each Right not owned by an
Acquiring Person (or by certain related parties and  transferees)  following the
event set forth in the preceding  paragraph would entitle its holder to purchase
$90  worth of Units of  Preferred  Stock  for $45.  Assuming  that the  Units of
Preferred  Stock had a per Unit  value of $10 at such  time,  the holder of each
valid Right would be entitled to purchase 9 Units of Preferred Stock for $45.

In the event that (i) the  Company  is  acquired  in a merger or other  business
combination  transaction in which the Company is not the surviving  corporation,
or (ii) fifty percent (50%) or more of the Company's  assets or earning power is
sold or transferred,  each holder of a Right (other than Rights that theretofore
become  null and void as  described  in the second  preceding  paragraph)  shall
thereafter have the right to receive, upon exercise thereof, common stock of the
acquiring  company  having a value equal to two times the exercise  price of the
Right.

Redemption of the Rights

At any time until the close of business on the tenth  business day following the
Shares  Acquisition  Date,  the Board of Directors of the Company may redeem the
Rights in whole,  but not in part, at a price of $.01 per Right (the "Redemption
Price"),  payable at the election of the Board of Directors,  in cash or Company
Common  Shares.  The redemption of the Rights may be made effective at such time
on such  basis,  with  such  conditions  as the Board of  Directors  in its sole
discretion may establish.  Immediately upon the action of the Board of Directors
of the Company  ordering  redemption  of the Rights,  the right to exercise  the
Rights  will  terminate  and the only right of the  holders of Rights will be to
receive the Redemption Price.

Exchange of the Rights

At any time after a person or group of affiliated or associated  persons becomes
an Acquiring Person,  the Board of Directors of the Company,  at its option, may
exchange  each Right (other than Rights owned by such person or group which have
become void), in whole or in part, for Common Shares or Units of Preferred Stock
at an exchange ratio of on Common Share or one Unit of Preferred Stock per Right
(subject to adjustment).

Amendment of the Rights Agreement

Any of the  provisions  of the  Rights  Agreement  may be  amended  without  the
approval  of the  holders  of  Company  Common  Shares at any time  prior to the
Distribution  Date.  After the  Distribution  Date, the provisions of the Rights
Agreement   may  be  amended  in  order  to  cure  any   ambiguity,   defect  or
inconsistency,  to make changes which do not  adversely  affect the interests of
holders of Rights  (excluding  the  interests of any  Acquiring  Person),  or to
shorten  or  lengthen  any time  period  under the Rights  Agreement;  provided,
however,  that no amendment to adjust the time period governing redemption shall
be made at such time as the Rights are not redeemable.

Exercise of the Right Entitles the Rightholder to the Rights of a Shareholder; 
Tax Consequences


Until a Right is exercised,  the holder thereof, as such, will have no rights as
a shareholder of the Company,  including,  without limitation, the right to vote
or to  receive  dividends.  While the  distribution  of the  Rights  will not be
taxable to shareholders or to the Company,  shareholders  may,  depending on the
circumstances,  recognize  taxable  income in the event that the  Rights  become
exercisable for Units of Preferred Stock.

Description of Preferred Stock

The Units of Preferred  Stock that may be acquired  upon  exercise of the Rights
will be  nonredeemable  and will be subordinate to any other shares of preferred
stock that have been or may be issued by the Company.

Each Unit of Preferred Stock will receive  ratably any dividend  declared on the
Company Common Shares.

In the event of  liquidation,  the holder of each Unit of  Preferred  Stock will
receive a preferred  liquidation  payment equal to the greater of $1.00 per Unit
or the per share amount paid in respect of a share of the Company Common Shares.

Each  Unit of  Preferred  Stock  will have one vote,  voting  together  with the
Company Common Shares.

In the event of any merger,  consolidation or other transaction in which Company
Common Shares are  exchanged,  each Unit of Preferred  Stock will be entitled to
receive  the per share  amount  paid in respect of each share of Company  Common
Shares.

The rights of holders  of the  Preferred  Stock to  dividends,  liquidation  and
voting,  and in the  event of  mergers  and  consolidations,  are  protected  by
customary antidilution provisions.

Because of the nature of the Preferred  Stock  dividend,  liquidation and voting
rights,  the economic value of one Unit of Preferred  Stock that may be acquired
upon the exercise of each Right is expected to approximate the economic value of
one share of Company Common Shares.

Copy of the Rights Agreement and Certificate of Amendment Available

A copy of the Rights  Agreement has been filed with the  Securities and Exchange
Commission as an Exhibit to a Current  Report on Form 8-K.  Copies of the Rights
Agreement and the Certificate of Amendment are available free of charge from the
Company. This summary description of the Rights and the Preferred Stock does not
purport to be complete  and is  qualified  in its  entirety by  reference to the
Rights  Agreement and the  Certificate of Amendment,  including the  definitions
therein of certain terms,  which Rights  Agreement and  Certificate of Amendment
are incorporated herein by reference.