Colleagues: What techniques do you use to calibrate your dial-type windrow thermometers to ensure the readings are accurate? Thanks, Craig Craig Coker | Coker Composting & Consulting 1213 Spradlin Rd., Vinton, VA 24179 Tel.: (540) 890-1086, Fax: (540) 890-1087 Cell: (540) 874-5168, Email: cscoker at verizon.net Web: www.cokercompost.com.