The Gypsy Gripper has a comfortable grip handle, and two large round suction cups with handy lock & release levers. Just press the suction cups to any plastic or metal ruler with a smooth surface, then flip the levers to lock The Gypsy Gripper in place. Now you can move the ruler quickly, and easily hold it on the exact position with gentle downward pressure. The Gypsy Gripper's suction cups will work with smooth surface rulers. The durable plastic body is waterproof and washable.

Rulers can be purchased here