G Pen ProG PEN PRO 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 generous ceramic oven imparts no flavors to your material, you only taste exactly what you load. The three