8-K

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                             Current Report Pursuant
                          to Section 13 or 15(d) of the
                       Securities and Exchange Act of 1934

        Date of Report (Date of earliest event reported) January 31, 2000
                                                        -----------------

                         ARIZONA INSTRUMENT CORPORATION
             ------------------------------------------------------
             (Exact Name of Registrant as Specified in Its Charter)


                                    Delaware
                 ----------------------------------------------
                 (State or Other Jurisdiction of Incorporation)


        0-12575                                          86-0410138
(Commission File Number)                    (I.R.S. Employer Identification No.)

  1912 West 4th Street, Tempe, Arizona                      85281
(Address of Principal Executive Offices)                  (Zip Code)

                                 (602) 470-1414
               ---------------------------------------------------
              (Registrant's Telephone Number, Including Area Code)

ITEM 4: CHANGE IN REGISTRANT'S CERTIFYING ACCOUNTANT.

     1.   On January 28,  2000,  the Company was notified  that the  McGladrey &
          Pullen,  LLP  had  acquired  the  attest  assets  of  the  Registrants
          independent  auditors  Toback CPAs P.C.  and that Toback CPAs would no
          longer be the auditor for the Registrant.  McGladrey & Pullen, LLP was
          appointed as the Registrant's new auditor.

     2.   The auditor's  reports from Toback CPAs P.C. for the Registrant's past
          fiscal  year did not  contain an adverse  opinion or a  disclaimer  of
          opinion,  and were not qualified or modified as to uncertainty,  audit
          scope,  or  accounting   principles.   Toback  CPAs  P.C.  became  the
          Registrant's  auditors  after  the  Registrant  dismissed  Deloitte  &
          Touche, LLP, auditors for the fiscal year ended December 31, 1997.

     3.   The  decision to engage  McGladrey & Pullen,  LLP was  approved by the
          board of directors.

     4.   During the  Registrant's  most recent  fiscal year and the  subsequent
          interim period preceding the change,  there have been no disagreements
          with Toback CPAs on any matter of accounting  principles or practices,
          financial statement disclosure, or auditing scope or procedure.

     5.   The  Registrant  has requested  Toback CPAs,  P.C. to furnish a letter
          addressed  to the  Commission  stating  whether  it  agrees  with  the
          statements made in this Item. Such letter is included in an exhibit to
          this Form 8K.

ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS.

          (c)  Exhibits

               Exhibit Number                        Description
               --------------                        -----------
                  16.1                   Letter regarding change of accountant


                                   SIGNATURES

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                                           ARIZONA INSTRUMENT CORPORATION
                                           (Registrant)

February 8, 2000                           By /s/ George G. Hays
                                             -----------------------------------
                                           George G. Hays
                                           President and Chief Executive Officer

EX-16.1

                                                                February 4, 2000


Securities and Exchange Commission
Washington, D.C. 20549


Gentlemen:

We  were   previously  the  independent   accountants  for  Arizona   Instrument
Corporation,  and on March 10, 1999 we reported  on the  consolidated  financial
statements of Arizona Instrument  Corporation and subsidiaries as of and for the
year ended December 31, 1998. On January 28, 2000 we informed Arizona Instrument
Corporation  that McGladrey & Pullen,  L.L.P. had acquired our attest assets and
we  would  no  longer  be the  independent  accountants  of  Arizona  Instrument
Corporation  We have read Arizona  Instrument  Corporation  statements  included
under  Item 4 of its Form 8-K for  February  4,  2000  and we  agree  with  such
statements.


                                        /s/ TOBACK CPAs, P.C.


Phoenix, Arizona
February 4, 2000