Exhibit 10.1

[GRAPHIC OMITTED] ELECTRONIC SENSOR TECHNOLOGY       1077 Business Center Circle
                                                     Newbury Park, CA 91320
                                                     Tel (805) 480-1994
                                                     FAX (805) 480-1984
March 26, 2007                                       www.estcal.com

Barry S. Howe
34 Christopher Lane
Sudbury, MA 01776

Dear Barry:

RE: OFFER LETTER OF EMPLOYMENT

Electronic Sensor Technology (the "Company" and "EST") is pleased to confirm
your employment on the following terms:

1. Position:             You will serve in the full time position as Chief
                         Operating Officer (COO). You will report directly
                         to the President and CEO for a trial period of 3
                         months. After this period, you will be evaluated
                         by the Company's Board of Directors and considered
                         for the position of Chief Executive Officer (CEO).
                         If you are appointed as the CEO, you will be
                         nominated for a seat on the Board of Directors.
                         Your employment will commence on your first day of
                         work.

2. Salary:               $150,000 per year which will be reviewed upon
                         appointment as the CEO. As a member of the
                         management team, you are eligible to participate
                         in EST performance bonus plan.

3. Stock Options:        An option to acquire 1.0 million shares of common
                         stock upon completion of the three-month trial
                         period and appointment by the Board of Directors
                         as the CEO. 100,000 options will be vested on the
                         date of grant and the remaining 900,000 options
                         will be vested in installments of 25% per year on
                         each anniversary date of hire.

4. Vacation:             Three weeks, with accrual based on EST's company
                         policy for full-time salaried employees. Paid time
                         off cannot be used until completion of 180
                         calendar days after the start of your employment.
<PAGE>

                         In addition, you are entitled to eight (8) company
                         paid holidays, 5 days off for personal time, and
                         up to 5 days for bereavement. The company also has
                         a compensatory time program.

5. Termination:          If terminated by the Company without cause,
                         termination pay will be zero for the first 3
                         months of employment, and then will increase to
                         .33 month's salary per month of employment to a
                         maximum of six (6) months. The termination payable
                         may be paid incrementally or in a lump sum at the
                         Company's option. Option vesting will be advanced
                         3 months in the event of termination without
                         cause.

6. Relocation:           The Company will pay $25,000 to cover your moving
                         expenses.

                         For the first three months, EST will pay for
                         temporary housing and provide you with a rental
                         automobile, gas and oil excluded. Additionally,
                         the Company will pay for two round trips for you
                         between Los Angeles and Boston, and one round trip
                         for your wife between Boston and Los Angeles.

7. Other conditions:     Must relocate to and work from the company's
                         location in Newbury Park, CA

8. Employee Benefits:    As a regular employee of the Company, you will be
                         eligible to participate in a number of
                         Company-sponsored benefits, all in accordance with
                         the Company's policies as in effect from time to
                         time. Under the company's current health insurance
                         plan, you will be eligible for company paid health
                         insurance coverage on the first day of the month
                         following 30 days on continuous employment. To
                         avoid any lapse of health insurance coverage, you
                         may choose to continue your current health
                         insurance policy for one more month and the
                         Company will reimburse you for the premiums paid.

9. 401K Plan:            Eligible to enroll in the company's 401K plan,
                         which may be amended from time to time, after one
                         year of employment with enrollment occurring on
                         the first of January or July following the end of
                         that period. Currently, EST contributes 3% of the
                         employee's earnings, subject to statutory limits,
                         to the company's 401K plan.

10. Assignment of Rights, Non-solicitation, confidentiality and non-disclosure
    Agreement:
                         You agree to execute the Assignment of Rights,
                         Non-Solicitation of Employees and Vendors,
                         Confidentiality and Non-Disclosure Agreements as
                         shall be provided to you by the Company.

                                       2
<PAGE>

11. Indemnification:     To the fullest extent permitted by the Company's
                         charter documents and applicable law, the Company
                         agrees to defend and indemnify you and hold you
                         harmless against any liability that you incur
                         within the scope of your employment with the
                         Company. The Company agrees to use commercially
                         reasonable efforts to purchase and maintain
                         adequate Directors' and Officers' liability
                         insurance.

12. Employment Relationship: Your employment with the Company is for no specific
                         period of time. Your employment with the Company
                         is "at will," meaning that either you or the
                         Company may terminate your employment at any time
                         and for any reason, with or without cause. Any
                         contrary representations that may have been made
                         to you are superseded by this letter agreement.
                         This is the full and complete agreement between
                         you and the Company on this term.

15. Outside Activities:  While you render services to the Company, you agree
                         that you will not engage in any other employment,
                         consulting or other business activity without the prior
                         written consent of the Company, which consent shall not
                         be unreasonably withheld. While you render services
                         to the Company, you also will not assist any
                         person or entity in competing against the Company,
                         in preparing to compete against the Company or in
                         hiring any employees or consultants of the
                         Company.

16. Withholding Taxes:   All forms of compensation referred to in this letter n
                         this agreement are subject to reduction to reflect
                         applicable withholding and payroll taxes and other
                         deductions required by law.

17. Entire Agreement:    Except as set forth herein, this letter agreement
                         supersedes and replaces any prior agreements,
                         representations or understandings whether written, oral
                         or implied, between you and the Company.

18. Your continued employment with EST is expressly contingent upon EST
    receiving, within seven (7) of your first day, the following:

          a.   Acceptable results from a background investigation. Any
               falsification of employment history or educational background
               will result in withdrawal of the offer and/or termination of
               employment.
          b.   Signed copies of the EST (i) Employee Agreement, (ii) Proprietary
               Information and Employee Inventions Agreement, and (iii) Employee
               Acknowledgment (of EST's Human Resources Policies and Procedures)
               Form, stating, among other things, that you will keep
               confidential company information throughout and beyond your
               employment with EST.
          c.   Satisfactory proof of identification and work authorization as
               required by the Immigration Reform and Control Act of 1990.

    Failure to execute the documents outlined above will be considered
    termination for cause.

                                       3
<PAGE>

19  Governing Law: This Agreement shall be governed by, and construed in
    accordance with, the internal laws of the State of California.

20. Counterparts: This Agreement may be in any number of counterparts with the
    same effect as if the signatures to each counterpart were upon a single
    instrument, and all such counterparts together shall be deemed an original
    of this Agreement.

21. Waiver of Jury Trial: TO THE FULLEST EXTENT PERMITTED BY LAW, YOU HEREBY
    IRREVOCABLY AND UNCONDITIONALLY WAIVE TRIAL BY JURY IN ANY LEGAL ACTION OR
    PROCEEDING RELATING TO THIS AGREEMENT OR YOUR EMPLOYMENT.

21. Judicial Reference: If any action or proceeding is filed in a court of the
    State of California by you in connection with any of the transactions
    contemplated by this Agreement or your employment, the court shall, and is
    hereby directed to, make a general reference pursuant to California Code of
    Civil Procedure Section 638 to a referee (who shall be a single active or
    retired judge) to hear and determine all of the issues in such action or
    proceeding (whether of fact or of law) and to report a statement of
    decision, provided that at the option of the Company, any such issues
    pertaining to a "provisional remedy" as defined in California Code of Civil
    Procedure Section 1281.8 shall be heard and determined by the court.

We hope that you will find the above terms acceptable. You may indicate your
agreement with these terms by signing and dating the enclosed letter agreement
and returning it to me. By signing this letter agreement, you reconfirm to the
Company that you have no contractual commitments or other legal obligations that
would prohibit you from performing your duties for the Company.

This offer of employment is open until March 30th, 2007 at 5:00PM (Pacific
Time).

Let me close by reaffirming our belief that the skills and background you bring
to EST will be instrumental to the future success of the Company. Barry, I look
forward to working with you as COO of EST.

Very truly yours,


/s/ Teong C. Lim
----------------------------------
Teong C. Lim
President
Electronic Sensor Technology, Inc.

                                       4
<PAGE>

I have read and accept and agree to the above terms of employment.


/s/ Barry S. Howe
-----------------
Barry S. Howe


Mar 28, 2007
-----------------
Dated

                                       5