The invention relates to a device for engaging objects, such as heat exchangers of varying sizes. The device includes at least one gripper provided with at least a first and a second gripper arm, at least one of which is movable with respect to the other gripper arm for enclosing an object therebetween; and a driving mechanism connected to at least one of the first and second gripper arms for closing or opening the gripper as needed, wherein at least one of the first and second gripper arms includes a first and a second gripper arm part that are pivotally coupled together, and an adjusting mechanism provided between the first and second gripper arm parts, the adjusting mechanism being arranged for adjusting the angle between the gripper arm parts in dependence on the diameter of the object to be engaged prior to engaging the object.