Good Afternoon, 

Thank you for emailing about the pressure canner gauge testing. We do offer that service around the state. I would recommend contacting Kara Lynch, Food Safety Educator housed in Isabella County. She covers the area of Gladwin County and may be the best person to assist you.   Her email is <personal data hidden> and that is currently the best way to contact her. 

If you do not hear back or have any other questions please do not hesitate to contact me for further assistance. 

Joe