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This information was assembled to assist State and Provincial Maple Producer Associations in developing and offering a simple hydrometer accuracy-checking program for their members.
The University of Vermont Extension’s “New” temperature compensation chart syrup hydrometers. 
One of the most important skills for sugarmakers to master is knowing when what’s boiling in the evaporator has become syrup. This guide to mesuring density explains the tools and techniques for accurate measurement.
Hydrometers are a critical tool for making high-quality, legal density maple syrup. A $20 to $30 investment in an accurate hydrometer can yield a valuable return in income for the producer. This article explains how to use and test a hydrometer for accuracy.