Abstract: A level pen/pencil or other writing instrument is equipped with an end-mounted level vial which mates with the pen/pencil barrel. The housing of the level is entirely clear allowing for the bubble of the level to be visible from all sides of the pen/pencil. The level pen/pencil is designed with sufficient length for reaching from a center of a child's head to a vertical wall surface for marking the child's height thereon. The level pen/pencil can also be used for other applications requiring both a level and a marking means such as construction, repair work, hanging pictures or shelves, or various other leveling and marking tasks.