G Pen (Grenco Science) Pro VaporizerDry Herb Convection Heating Vaporizer delivering clean tasting, smooth, and flavor rich vapor free of irritants. Continuing in the long line of superior vaporizer engineering, the G Pen Pro from Grenco raises the bar once again by utilizing a huge ceramic oven that heats instantly in a sleek, refined, yet perfectly ergonomic form factor. Despite its small size, the G Pen Pro has a large battery that will keep you vaping session after session. The