Looking at one's hands by the flame of Havdalah

Hi,

The Tur and Shulchan Aruch cite midrashic sources as the basis for the custom of looking specifically at one's fingernails, and in a particular way, at havdalah. Therefore, even though one could benefit from the light in some other way, we should specifically continue this ancient practice. We keep our ancient customs.

(Rav Moshe Feinstein, Igrot Moshe Orach Chaim 5:20:31)

Have a great day,
Mordechai