<PAGE>

EXHIBIT 10.3

                                 AGREEMENT Ingen Technologies, Inc. and Bob Sand


INGEN
TECHNOLOGIES, INC.
285 E. County Line Road, Calimesa California 92320
(800) 259-9622   FAX: (800) 777-1186


                              CONTRACTING AGREEMENT

This Agreement made effective as of this 1st day of January, 2005, by and
between Bob Sand, an individual, further referred to as the ("Contractor"),
whose principal address is 10442 Mountain Lion Lane, Grass Valley, California
95949; and INGEN TECHNOLOGIES, INC., A Nevada Corporation, further referred to
as the ("Company"), whose principal address is 285 E. County Line Road,
Calimesa, California 92320, and is made with reference to the following.

                                    RECITALS

A.   The Company is a Medical Device Manufacturer, and in the business of
     providing medical products and services on a Global basis. Said products
     and services are inclusive of, but not limited to, vestibular function
     testing and balance testing.

B.   The Company desires to exclusively engage the services of the Contractor to
     market physicians within the domestic United States to sell Secure
     Balance(TM) programs as described in Schedule-A. The Contractor also agrees
     to develop various markets for services for all of North America, as well
     as any future services that the Company deems authorized. The Company will
     use the Contractor as its' exclusive agent to provide those services
     described in Schedule-A.

C.   The Company authorizes export rights to the Contractor for all sales of the
     Secure Balance (TM) program outside the United States. The Contractor
     accepts to sell the Secure Balance (TM) program outside the United States.
     The Secure Balance (TM) program includes the services and medical equipment
     as described in Exhibit-A.

C.   The Contractor has the expertise, knowledge and resources for development
     and implementation of the services described in Schedule-A.

D.   The Company will provide product, installation, training, market
     assistance, promotional materials and other developmental documentation
     used to promote said products and services in accordance to all laws of
     which govern the Company in this type of industry.

E.   The Company desires to utilize the Contractor's expertise, knowledge and
     other resources for developing and promoting said services as described in
     the above Recitals for the purpose of establishing sales of vestibular
     testing products for the Contractor's client base, and as such, the
     Contractor desires to use the Company's client base for delivering the
     services as described in Schedule-A.


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                                 AGREEMENT Ingen Technologies, Inc. and Bob Sand


NOW, THEREFORE, the Parties mutually agree as follows:


1.   In consideration of the Contractor furnishing the expertise, knowledge and
     other resources in providing said services and market assistance as set
     forth in the above Recitals hereof, the Company agrees to issue 100,000
     Shares as Restricted Rule-144 public stock, in addition the Company will
     pay commissions of two thousand dollars ($ 2,000) for each VNG systems
     sold, and one thousand dollars ($1,000) for each therapy system sold. Such
     acceptance will be in the form of a signed agreement between the customer
     and the Company. The said transaction will be verification of acceptance
     and submitted to the Contractor. The Company will pay the Contractor all of
     the commission within seven (7) days of receipt of payment from the
     customer or third party lender.

2.   The Company authorizes the Contractor, and any of his sub-marketing groups,
     to market, promote and sell the products and services of the Company as
     described in Exhibit-B. Any other products and services offered by the
     Company are not a part of this Agreement and may not be sold and/or
     marketed by the Contractor without the written permission or authorization
     from the Company.

3.   As a part of the services specified herein, the Contractor accepts the
     above considerations and understands his/her rights to sell said services
     within the United States. The Contractor agrees to provide his/her "best
     efforts" to deliver those services as described in Schedule-A.

4.   The Contractor is only responsible to market and sell the Secure
     Balance(TM) program. The Company is responsible to provide installation,
     training and support to the customer.

5.   Except for the amounts paid to the Contractor as stated in paragraph-1 and
     within the Recitals herein, the Contractor shall not be entitled to other
     payment and/or reimbursement for expenses incurred pursuant to this
     Agreement. All costs and expenses incurred by the Contractor in rendering
     said services shall be reimbursed or advanced by the Company only upon
     written authorization to the Contractor by the Company.

6.   The Company agrees to provide full and proper assistance to the Contractor
     inclusive of administrative support, technical support, and professional
     support on a best efforts basis and within regulatory guidelines and laws
     set forth for providing said services and without penalty to the
     Contractor.


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                                 AGREEMENT Ingen Technologies, Inc. and Bob Sand


7.   The Contractor agrees to provide the Company with proper tax documentation
     and identification upon the signing of this Agreement in accordance to
     State and Federal tax laws.

8.   The relationship between both parties created by this Agreement is that of
     principal ("the Company") and Outside Contractor ("the Contractor") in that
     the time spent and the professional manner in which the services are
     performed shall solely be the responsibility of the Contractor. However,
     the Contractor agrees to use their best and most diligent efforts, within
     all laws, to provide the resources and expertise under the terms and
     conditions setforth herein.

9.   During the term of this Agreement the Contractor has the right to promote
     services, either directly and/or indirectly, to any entity that has a
     similar products as provided by the Company for the duration of this
     Agreement.

10.  In consideration of the importance of confidentiality, non-disclosure and
     trade secrets, the Contractor acknowledges that during the course of this
     Agreement between the Company and the Contractor, the Contractor has had
     access to and will continue to have access to various confidential
     information and trade secrets consisting of compilations of information,
     records, specifications and trade lists, which are owned by the Company and
     which are regularly used in the operation of the Company's business. The
     Contractor specifically agrees to NOT distribute the product pricing of the
     Company, nor use the brand name on any of their pricing to their clients.
     Further, the Contractor will agree to keep confidential all material
     related to or made a part of this Agreement from any client, employee,
     associate and/or the like.

     In consideration of continued engagement through this Agreement during the
     period of the Agreement by the Company, the Contractor shall not disclose
     any of the aforesaid confidential information or trade secrets, directly or
     indirectly, nor use them in any way, either during the term of this
     Agreement or at any time thereafter, except as required in the Contractor's
     engagement with the Company, but does not include information already
     within the public domain at the time the information is acquired by the
     Contractor, or information that subsequently becomes public through no act
     or omission of the Contractor.

     In further consideration of continued engagement and during the period of
     the Agreement, all files, records, documents, drawings, specifications,
     equipment and similar items relating to the business of the Company,
     whether prepared by the Contractors or otherwise, coming into the
     Contractor's possession shall remain the exclusive property of the Company
     and shall not be removed from the Company's premises under any
     circumstances whatsoever without prior written consent of the Company.

11.  This Agreement shall continue in effect for a period of two years (2-yrs),
     and may be continued thereafter only by the express mutual agreement of
     both parties. This agreement may be terminated only for cause or breech of
     any terms and conditions setforth herein.


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                                 AGREEMENT Ingen Technologies, Inc. and Bob Sand


12.  This document contains the entire Agreement of the parties relating to this
     Agreement and correctly sets forth the rights, duties and obligations of
     all parties hereto. Any prior agreements, promises, negotiations and/or
     representations not expressly set forth in this Agreement is of no force
     and effect.

13.  No waiver of any term or condition of this Agreement shall be deemed or
     construed to be a waiver of such term or condition in the future, or of any
     preceding or subsequent breach of the same or any other term or condition
     of this or any other agreement. All remedies, rights, undertakings,
     obligations and agreements contained in this Agreement shall be cumulative
     and none of them shall be in limitation of any other remedy, right,
     undertaking, obligation or agreement of either party hereto.

14.  No amendment or modification of this Agreement or of any covenant,
     condition or limitation herein contained shall be valid unless in writing
     and duly executed by the party to be charged therewith. Unless otherwise
     specifically set forth under a particular provision, any amendment or
     modification shall require the overall consent of both parties.

15.  Nothing contained in this Agreement shall be construed so as to require the
     commission of any act contrary to law, and whenever there is a conflict
     between any provision of this Agreement and any statute, law, ordinance,
     rule, order or regulation, the later shall prevail, but in such event any
     such provision of this Agreement shall be curtailed and limited only to the
     extent necessary to bring it within the legal requirements.

16.  This Agreement, and all rights and obligations contained herein shall be
     binding on and inure to the benefit of the parties hereto and their
     respective heirs, executors, legal and personal representatives, successors
     and assigns. It is also specifically agreed and understood that this
     Agreement shall be binding upon any successor-in-interest to the Company by
     way of merger, consolidation or otherwise.

17.  Any controversy arising out of or in connection with this Agreement, or any
     amendment thereof, shall be determined and settled by arbitration in
     accordance with the rules of the American Arbitration Association. The
     venue for such arbitration shall be exclusively San Bernardino County, the
     State of California, and any award rendered shall be final and binding on
     each and all of the parties thereto and their successor-in-interest, and
     judgment may be entered thereon in any court having jurisdiction thereon.
     In any such proceeding, the Arbitrator shall be and hereby is empowered to
     render an award directing specific performance. Each individual party shall
     take responsibility for obligations pertaining to costs associated with
     their own legal representation.

18.  All notices among the parties hereto shall be in writing and shall be
     deemed duly served when personally delivered to another party or, in lieu
     of such personal service, when deposited in the United States mail,
     certified and return receipt requested, with first class postage prepaid
     thereon, addressed as set forth above, or in such other place as may be
     specified in any written notice given pursuant to this paragraph as the
     address for service of notice. All notices shall be delivered to the
     parties addresses as witnessed below.


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                                 AGREEMENT Ingen Technologies, Inc. and Bob Sand


                  Company:          Scott Sand, CEO & Chairman
                                    Ingen Technologies, Inc.
                                    285 E. County Line Rd.
                                    Calimesa, CA 92320
                                    (800) 259-9622
                                    Tax ID No. 88-0429044

                  Contractor:       Bob Sand
                                    10442 Mountain Lion Lane
                                    Grass Valley, California 95949
                                    (530) 273-1514


19.  This Agreement shall be governed and construed in accordance with laws of
     the State of California.

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
     the date first set forth above and agree to all of the terms and conditions
     of this Agreement setforth herein.



         The Contractor:

                           --------------------------------   ------------------
                           Bob Sand, Individual                      Date



         The Company:
                           /s/ Scott Sand                      January 1, 2005
                           --------------------------------   ------------------
                           Scott Sand, CEO                           Date




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                                 AGREEMENT Ingen Technologies, Inc. and Bob Sand



                                   SCHEDULE-A

                  SERVICES PROVIDED BY INGEN TECHNOLOGIES, INC
                  --------------------------------------------


1.   Preferred Provider Care will provide a 2-day balance medicine training
     program (focused on test reading) here in Jacksonville for all of your
     physicians and technician customers who require training and assistance for
     their new VNG private-label equipment. This seminar will include all
     training manuals, as well as the opportunity for hands on training for
     physicians and technicians and the opportunity for question and answer
     sessions with staff (underwritten by Preferred Provider Care.)

2.   Attendees are responsible for their own travel arrangements, all travel
     costs and incidentals.

3.   Ingen Technologies, Inc. will provide equipment, training and clinical
     support to the physician.





Contract will be valid for two years.



-----------------------------------
Scott Sand, CEO & Chairman


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                                 AGREEMENT Ingen Technologies, Inc. and Bob Sand



                                    EXHIBIT-A

                         PHYSICIAN ACCEPTANCE AGREEMENT

     THE PURCHASING PHYSICIAN AND/OR INSTITUTION HAS AGREED TO ACCEPT SERVICES
     FROM MEDICORE, INC. FOR EQUIPMENT, TRAINING AND CLINICAL SUPPORT. THAT
     SUPPORT INCLUDES THE FOLLOWING:


1.   Preferred Provider Care will provide a 2-day balance medicine training
     program (focused on test reading) here in Jacksonville for all of your
     physicians and technician customers who require training and assistance for
     their new VNG private-label equipment. This seminar will include all
     training manuals, as well as the opportunity for hands on training for
     physicians and technicians and the opportunity for question and answer
     sessions with staff (underwritten by Preferred Provider Care.)

2.   Attendees are responsible for their own travel arrangements, all travel
     costs and incidentals.

3.   Ingen Technologies, Inc. will refer physicians to MediCore, Inc., and
     MediCore will provide equipment, technician and clinical support to the
     physician.

4.   MediCore, Inc. will provide a contract agreement with the Physician
     regarding considerations for providing equipment, technician and clinical
     support.





     Accepted By: ______________________________    __________________
                         Physician Name                    Date



                                  Page 7 of 8
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                                 AGREEMENT Ingen Technologies, Inc. and Bob Sand



                                    EXHIBIT-B
                          PRODUCT LIST SOLD TO CUSTOMER

ITI INGEN TECHNOLOGIES, INC.                       PROFORMA INVOICE
285 E. COUNTY LINE ROAD
CALIMESA CA 92320
(800) 259-9622


ITEM QTY    PART NO.                     DESCRIPTION                     PRICE
================================================================================

1   1ea.   Model-4000A   Secure Balance 2 Channel VNG                 $38,000.00
                         Complete with computer system,
                         1-Camera Goggle,Oculomotor Full-Field Projector
                         Secure Balance(TM) Full Clinical VNG Software
                         version 1.00
                         Atmos Air Irrigator and Scope
                         Installation and training (On-Site).
                         2-Day Physician Interpretation Workshop
                         Tower Computer or Laptop Notebook
                         HP Color Printer

2   1ea.   Model-4000    SPORTKAT Balance System                      $15,000.00
                         Balance Therapy & Posturograhy Platform
                         VVP Computer Data System
                         Assessment & Treatment Software 3.02
                         Flat Panel Display Computer System
                         Base Unit 360 Degree Platform w/Tilt Sensor
                         Handrails with Gauge Readout PSI
                         DC-Power Supply
                         Installation and Training (On-Site)

3   1ea.                 3-Month Consultation Program for
                         unlimited balance telephone support
                         related to coding, pricing, billing & collections

                         Full Warranty 1-Year
                         Software Upgrades - No Charge


Grand Total                                                           $53,000.00

                          TAX and FREIGHT NOT INCLUDED

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50% DEPOSIT/50% DELIVERY        FOB: CALIMESA CA         DELIVERY: 2-4 WEEKS ARO
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