【how to use】It is used in combination with AV-CHECK, a test paper for determining the degree of deterioration of heated oils and fats.After 30 seconds have passed since oil was dropped on the AV-CHECK test paper,By shooting the test paper and the mount (color sample) at the same time,You can check the acid value measurement result judgment of fats and oils.* AV-CHECK is a registered trademark of Toyo Filter Paper Co., Ltd.