TECH LABORATORIES, INC.

                             STOCK OPTION AGREEMENT

     This Stock Option Agreement (this  "Agreement") is made and entered into as
of the Date of Grant set forth below (the "Date of Grant") by and  between  Tech
Laboratories,  Inc., a New Jersey corporation (the "Company"),  and the Optionee
named below ("Optionee").

Optionee:                             Bernard M. Ciongoli

Social Security Number:

Optionee's Address:                   17 Liberty Ridge Trail
                                      Totowa, New Jersey 07512

Total Option Shares:                  300,000

Exercise Price Per Share:             $0.50

Date of Grant:                        October 1, 1998

Vesting Start Date:                   October 1, 1998

Expiration Date:                      October 1, 2003

Type of Stock Option
(Check one):                          |_|  Incentive Stock Option

                                      |X|  Nonqualified Stock Option

     1. Grant of Option.  The Company  hereby grants to Optionee an option (this
"Option")  to purchase up to the total  number of shares of Common  Stock of the
Company set forth above as Total Option Shares  (collectively,  the "Shares") at
the Exercise Price Per Share set forth above (the "Exercise Price"). This Option
is not intended to qualify as an  "incentive  stock option"  ("ISO")  within the
meaning of Section 422 of the  Internal  Revenue  Code of 1986,  as amended (the
"Code").

     2. Vesting; Exercise Period.

     2.1. Vesting Of Shares.  This Option shall be exercisable as it vests. This
Option  shall  vest and  become  exercisable  as to  portions  of the  Shares as
follows:  (a) this Option  shall not be  exercisable  with respect to any of the
Shares until  October 1, 1998 (the "First  Vesting  Date");  (b) if Optionee has
continuously  provided  services to the Company,  or any parent or Subsidiary of
the  Company,  then  on  the  First  Vesting  Date,  this  Option  shall  become
exercisable as to 100,000  Shares;  and (c) thereafter  this Option shall become
exercisable as to an additional 100,000 Shares on each yearly anniversary of the
First Vesting Date for two (2) years,  provided  that Optionee has  continuously
provided services to the Company, or any Parent or Subsidiary of the Company.




     2.2.  Vesting of Options.  Shares that are vested  pursuant to the schedule
set forth in Section 2.1 hereof are "Vested  Shares." Shares that are not vested
pursuant to the schedule set forth in Section 2.1 hereof are "Unvested Shares."

     2.3. Expiration.  This Option shall expire on the Expiration Date set forth
above  and  must be  exercised,  if at all,  on or  before  the  earlier  of the
Expiration  Date or the date on which  this  Option  is  earlier  terminated  in
accordance with the provisions of Section 3 hereof.

     3. Termination.

     3.1.  Termination  For Any Reason Except Death,  Disability,  or Cause.  If
Optionee is Terminated for any reason except  Optionee's death,  disability,  or
cause,  then this  Option,  to the extent  (and only to the  extent)  that it is
vested in  accordance  with the  schedule set forth in Section 2.1 hereof on the
Termination  Date,  may be  exercised by Optionee no later than three (3) months
after the Termination Date, but in any event, no later than the Expiration Date.

     3.2. Termination Because of Death or Disability.  If Optionee is Terminated
because of death or  disability  of Optionee (or Optionee  dies within three (3)
months after  Termination  other than for cause or because of disability),  then
this Option, to the extent that it is vested in accordance with the schedule set
forth in  Section  2.1  hereof on the  Termination  Date,  may be  exercised  by
Optionee (or Optionee's legal  representative  or authorized  assignee) no later
than twelve (12) months after the  Termination  Date, but in any event, no later
than the Expiration Date.

     3.3.  Termination  for Cause.  If Optionee is  Terminated  for cause,  this
Option will expire on Optionee's date of Termination.

     4. Manner of Exercise.

     4.1. Stock Option Exercise Agreement. To exercise this Option, Optionee (or
in  the  case  of  exercise  after  Optionee's   death,   Optionee's   executor,
administrator, heir, or legatee, as the case may be) must deliver to the Company
an executed  stock  option  exercise  agreement in the form  attached  hereto as
Exhibit A, or in such other form as may be approved by the Company  from time to
time (the "Exercise  Agreement"),  which shall set forth, inter alia, Optionee's
election to exercise  this  Option,  the number of shares being  purchased,  any
restrictions  imposed  on the Shares and any  representations,  warranties,  and
agreements regarding  Optionee's  investment intent and access to information as
may be required by the Company to comply with  applicable  securities  laws.  If
someone other than Optionee exercises this Option,  then such person must submit
documentation  reasonably  acceptable  to the  Company  that such person has the
right to exercise this Option.

     4.2. Limitations on Exercise.  This Option may not be exercised unless such
exercise is in compliance with all applicable federal and state securities laws,
as they are in effect on the date of exercise.

     4.3. Payment.  The Exercise  Agreement shall be accompanied by full payment
of the  Exercise  Price for the shares  being  purchased  in cash (by check) or,
where permitted by law:

          (a) by cancellation of indebtedness of the Company to Optionee;


                                       -2-


          (b) provided that a public market for the Company's stock exists:  (1)
     through a "same day sale" commitment from Optionee and a broker-dealer that
     is a member of the National  Association  of Securities  Dealers,  Inc. (an
     "NASD Dealer"), whereby Optionee irrevocably elects to exercise this Option
     and to sell a portion as of the Shares so purchased to pay for the Exercise
     Price, and whereby the NASD Dealer irrevocably commits upon receipt of such
     Shares to forward  the  Exercise  Price  directly  to the  Company;  or (2)
     through a "margin"  commitment  from  Optionee and an NASD Dealer,  whereby
     Optionee  irrevocably  elects to  exercise  this  Option  and to pledge the
     Shares so purchased to the NASD Dealer in a margin  account as security for
     a loan  from the NASD  Dealer  in the  amount of the  Exercise  Price,  and
     whereby the NASD Dealer irrevocably  commits upon receipt of such Shares to
     forward the Exercise Price directly to the Company; or

          (c)  Optionee  may elect to receive  Shares equal to the value of this
     Option by deliering the Excercise  Agreement with the provision  marked off
     for a cashless exercise. In such event, the Company shall issue to Optionee
     the number of shares of Common Stock,  as  applicable,  computed  using the
     following formula:

                             (Y) (A-B)
                        X = ----------
                                 A

          Where:    X = The final number of Shares to be issued to Optionee.

                    Y = The  number of Shares to be  canceled  pursuant  to such
                        exercise  of options  granted  under  this Stock  Option
                        Agreement.

                    A = The fair market value of one share of the Common Stock.

                    B = Exercise   Price  (as  adjusted  to  the  date  of  such
                        calculations).

     4.4. Tax Withholding.  Prior to the issuance of the Shares upon exercise of
this Option,  Optionee must pay or provide for any  applicable  federal or state
withholding  obligations of the Company.  If the Company  permits,  Optionee may
provide  for  payment of  withholding  taxes  upon  exercise  of this  Option by
requesting  that the Company retain Shares with a Fair Market Value equal to the
minimum amount of taxes required to be withheld. In such case, the Company shall
issue the net number of Shares to Optionee by deducting the Shares retained from
the Shares issuable upon exercise.

     4.5. Issuance of Shares.  Provided that the Exercise  Agreement and payment
are in form and substance  satisfactory to counsel for the Company,  the Company
shall issue Shares  registered  in the name of Optionee,  Optionee's  authorized
assignee,  or Optionee's legal  representative,  and shall deliver  certificates
representing the Shares with the appropriate legends affixed thereto.

     5.  Compliance with Laws and  Regulations.  The exercise of this Option and
the  issuance  and  transfer  of Shares  shall be subject to  compliance  by the
Company  and  Optionee  with all  applicable  requirements  of federal and state
securities  laws and with all applicable  requirements  of any stock exchange on
which the  Company's  Common Stock may be listed at the time of such issuance or
transfer.  Optionee  understands  that the  Company  is under no  obligation  to
register or qualify the Shares with the Securities and Exchange Commission,  any
state securities commission or any stock exchange to effect such compliance.


                                       -3-


     6.  Nontransferability of Option. This Option may not be transferred in any
manner other than by will or by the laws of descent and distribution, and may be
exercised  during the lifetime of Optionee  only by Optionee.  The terms of this
Option  shall be binding upon the  executors,  administrators,  successors,  and
assigns of Optionee.

     7. Privileges of Stock Ownership. Optionee shall not have any of the rights
of a  stockholder  with  respect  to any  Shares  until the Shares are issued to
Optionee.

     8.  Interpretation.  Any  dispute  regarding  the  interpretation  of  this
Agreement  shall  be  submitted  by  Optionee  or the  Company  to the  Board of
Directors of the Company for review. The resolution of such dispute by the Board
of Directors shall be final and binding on the Company and Optionee.

     9. Entire Agreement. This Agreement and the Plan and the Exercise Agreement
constitute the entire agreement and understanding of the parties hereto and with
respect to the subject matter hereof, and supersede all prior understandings and
agreements with respect to such subject matter.

     10.  Notices.  Any notice  required to be given or delivered to the Company
under the terms of this  Agreement  shall be in  writing  and  addressed  to the
Corporate  Secretary  of the Company at its  principal  corporate  offices.  Any
notice  required to be given or  delivered  to Optionee  shall be in writing and
addressed to Optionee at the address indicated above or to such other address as
such  party may  designate  in  writing  from time to time to the  Company.  All
notices shall be deemed to have been given or delivered upon: personal delivery;
three  (3)  days  after  deposit  in the  United  States  mail by  certified  or
registered mail (return receipt  requested);  one (1) business day after deposit
with any return receipt express courier (prepaid); or one (1) business day after
transmission by facsimile.

     11. Successors and Assigns.  The Company may assign any of its rights under
this Agreement. This Agreement shall be binding upon and inure to the benefit of
the  successors  and  assigns of the  Company.  Subject to the  restrictions  on
transfer set forth  herein,  this  Agreement  shall be binding upon Optionee and
Optionee's heirs, executors, administrators, legal representatives,  successors,
and assigns.

     12.  Governing  Law. This  Agreement  shall be governed by and construed in
accordance with the internal laws of the State of New Jersey,  without regard to
that body of law pertaining to choice of law or conflict of law.

     IN WITNESS WHEREOF, the Company has caused this Agreement to be executed in
duplicate by its duly  representative,  and Optionee has executed this Agreement
in duplicate as of the Date of Grant.

TECH LABORATORIES, INC.                    OPTIONEE


By:
   --------------------------              -----------------------------
   Earl Bjorndal                           Bernard M. Ciongoli
   Vice President


                                       -4-


                                    Exhibit A

                             TECH LABORATORIES, INC.
                         STOCK OPTION EXERCISE AGREEMENT

     I hereby  elect to  purchase  the number of shares of Common  Stock of Tech
Laboratories, Inc. (the "Company") as set forth below:


Optionee:
         -----------------------------------------------------------------------
Social Security Number:
                       ---------------------------------------------------------
Address:
        ------------------------------------------------------------------------


Type of Option:   |_|  Incentive Stock Option

                  |X|  Nonqualified Stock Option

Number of Shares Purchased:
                           -----------------------------------------------------
Purchase Price per Share:
                         -------------------------------------------------------
Aggregate Purchase Price:
                         -------------------------------------------------------
Date of Option Agreement:
                         -------------------------------------------------------

Exact Name of Title to Shares:
                              --------------------------------------------------


     1. Delivery  Purchase  Price.  Optionee  hereby delivers to the Company the
Aggregate  Purchase Price, to the extent  permitted in the Option Agreement (the
"Option Agreement") as follows (check as applicable and complete):

|_|  In cash (by  check) in the amount of  $______________,  receipt of which is
     acknowledged by the Company;

|_|  By cancellation of indebtedness of the Company to Optionee in the amount of
     $______________; or

|_|  Through the cashless exercise provision of the agreement.

2. Market  Standoff  Agreement.  Optionee,  if  requested  by the Company and an
underwriter of Common Stock (or other  securities of the Company,  agrees not to
sell or otherwise  transfer or dispose of any Common Stock (or other securities)
of the Company  held by Optionee  during the period  requested  by the  managing
underwriter  following the  effective  date of a  registration  statement of the
Company filed under the Securities Act, provided that all officers and directors
of the Company are required to enter into a similar  agreement.  Such  agreement
shall be in writing in a form  satisfactory to the Company and such underwriter.
The Company may impose stop-transfer instructions with respect to the shares (or
other  securities)  subject to the foregoing  restriction  until the end of such
period.


Date:
     ---------------------------                 -----------------------------
                                                 Signature of Optionee


                                       -5-