G Pen (more formally known as Grenco Science) is a vape pen manufacturer that has been around since the beginning of the vaping craze. They got their start by focusing on vape oils and other liquids for aromatherapy treatment. Since then, they have greatly expanded their product line to not only include a number of vape pens for liquids, but also pens for dry herb, concentrates, and other specialty products. While their products vary, the focus on making sure their products are very easy to use, full of useful features, and are conveniently portable. Read this article to learn everything about G Pen vaporizers.