Easy to use, just dip the strip in oil or drip , and then wait for a few seconds, then, you hold the essential oils test strip a few inches from your nose, and then briefly take a sip, finally write down what kind of oil it is on the wide end of the strip. Features -Color: White -Material: Cotton paper -Size: 12.00X3.50X0.01cm/4.72X1.38X0.003 in. - Helping you quickly classify the liquid, which can also be applied to determine if someone has lost their sense of smell. - Small and portable, lightweight and compact to be carried around, meeting your need no matter where and when. - Great for beauty shop, mall, home, counter, cosmetics store, professional, etc. - Very suitable for testing aromatherapy oils, perfumes, essential oils and more. - Specifically designed to absorb fragrances and easily to test. Sufficient quantity for your needs. Package list: Perfume Test Strips