Upcoming W&M Serviceperson Examination Schedule

The state is taking proactive steps to mitigate the spread of COVID-19 in Michigan. We appreciate your understanding and cooperation in reducing the coronavirus risk to Michigan residents.


For current and up-to-date information regarding the Coronavirus visit http://www.Michigan.gov/Coronavirus or http://www.CDC.gov/Coronavirus


The following tests are scheduled for each of the following sessions

  • Tuesday, September 15, Wednesday, September 16, 2020

  • Tuesday, November 17, Wednesday, November 18, 2020

  • Tuesday, December 1, Wednesday, December 2, 2020

Categories Available for Examination:

  • Agri. Chemical
  • Belt-Conveyor Scales
  • High Flow Retail Meters
  • Livestock Scales
  • Loading Rack Meters
  • L.P. Gas Meters
  • Mass Flow Meters
  • Medium Capacity Scales
  • Multiple Dimension Measuring Device
  • NIST Handbook 44
  • P.A. 283, MI Weights & Measures Law
  • Railway Track Scales
  • Retail Computing Scales
  • Retail Motor Fuel Dispensers
  • Vehicle Scales
  • Vehicle Tank Meters (Other than LPG)

Examination Registration Forms:

Examples of Voluntary Registration Exam Questions

You must pre-register for the exams you wish to take. 


E. C. Heffron Metrology Laboratory
940 Venture Lane
Williamston, Michigan 48895

Preparation Checklist

  • Complete and mail in the Serviceperson Registration Application (including either the $300 agency fee or $100 person fee or both if you are a single serviceperson agency).
  • Pre-register for the examination using the Examination Registration Form.
  • Copies of the handbook will be provided on-site. Pens or pencils will not be provided.
  • Thoroughly review all applicable materials (including all Weights and Measures Advisories found on this website).
  • Exam administrators are not permitted to discus questions, answers, or direct applicants in any manner.
  • 8:30 a.m.: Review of Placed-in-Service guidelines
  • 8:45 a.m.: Testing Begins
  • 3:30 p.m.: Testing Concludes

After Exam:

  • The exam will be graded immediately after being completed (80% or better answered correctly to pass). Only one retake will be allowed per fee submission.
  • A picture will be taken which will be transferred onto a personal wallet sized Michigan Serviceperson Identification Card


  • Please return the Examination Registration Form with your completed application and fee(s) as soon as possible, as seating is limited.

  • The test registration form will NOT be processed until after a completed Serviceperson Registration Form has been received.


NOTE: It is strongly encouraged to review all information on the "Service Person Registration" and the applicable "Weights and Measures Advisories" on this website.

We appreciate your cooperation in voluntarily applying to become a Registered Serviceperson in the State of Michigan.