SR (Standard Resistance)

This refers to the resistance of an atomiser or cartomiser and is measured in ohms. A standard resistance atomiser or cartomiser will have a rating between 2.5 and 2.8 ohms.

This type of atomiser or cartomiser tends to produce a moderate vapour with a mild hit at the back of the throat, what I would call a smooth vape. They were designed to be used on batteries running at 3.7v.