Moisture meters are used to determine the amount of moisture within grain presented for sale, a critical assessment of quality that affects the value and storability of the grain. The Agricultural Marketing Service (AMS), Federal Grain Inspection Service (FGIS) uses the DICKEY-JOHN GAC 2500-UGMA and Perten AM 5200-A as Official Moisture Meters for all officially inspected grains and commodities.
DICKEY-JOHN GAC 2500-UGMA
- Download all official moisture calibration files for DICKEY-JOHN GAC 2500-UGMA (zip)
- Official calibration installation instructions for DICKEY-JOHN GAC 2500-UGMA (pdf)
- Official Calibration installation instructions for DICKEY-JOHN GAC 2700-UGMA CALIBRATION (pdf)
Perten AM 5200-A
- Download all official moisture calibration files for Perten AM 5200-A (zip)
- Official calibration installation instructions for Perten AM 5200-A (pdf)
Official Moisture Calibrations
Official Moisture Meter Checktest Procedures
- UGMA-Compatible Moisture Meter Checktesting Procedures (pdf)
- UGMA-Compatible Moisture Checktesting Form (xlsx)
- Equipment Capability Testing (ECT) Checktesting Procedure (pdf)
Technical Reference Materials
- UGMA moisture meter accuracy for officially inspected grains and commodities (pdf)
- UGMA Criteria Document (pdf)
- UGMA Criteria Attachment A (pdf)
- UGMA Recipe Book (pdf)
- UGMA Technology Overview (pdf)
- Explanatory Notes for August 1, 2024 Official Moisture Calibration Updates (pdf)
Scientific Publications (Available on Request)
- UGMA First Research Report (GIPSA 2001)
- UGMA Development Overview (IQGC 2004)
- UGMA Unified Parameter Development (IQGC 2004)
- UGMA Development Report 2006 (MST 2006)
- UGMA Effects of Test Cell Loading Methods (ISEMA 2011)
- UGMA Secondary Density Correction (ISEMA 2011)
Contact Us
For additional information regarding Moisture Equipment, please contact Jeffrey.L.Vanfossan@usda.gov