Accepted Reference Value (ASTM D3764) / Reference / Reference Test / Validation Reference Value. The numerical value of the particular property reference material against which the analyser result is compared. A value that serves as an agreed reference for comparison, which can be an established theoretical value based on scientific principles, and assigned more certified value based on experimental work of some national or international organisation, or a consensus value based on collaborative experimental work under the auspices of a scientific or engineering group.