Free Fay Acid (FFA) Meter is a microprocessor based portable instrument measures the acid value of Oil samples. The fay acids in Oil get detached from the triglycerides during manufacturing or improper storage. The Free fay acids contributes to Oil rancidity and causes deterioration and off flavour of the Oil. The lower the FFA, the beer is the oil quality and its preservation status.

In measurement, the sample Oil is treated with reagents to form a colored dye. The instrument measures the absorbance of the colored dye and relates it to the free fay acids as % of Oleic acid. The instrument is previously calibrated using FFA standard Oleic acid of known concentration .