The single-sided double sheet control systems are best suited for destacking operation of all kinds. For magnetic materials sensors based on permanent magnets and electro magnets are used. Permanent magnetic sensors are better suited for thin material because the force of attraction. The electromagnetic sensors excert no force after measurement and can measure up to 7.50 mm single sheet thickness. A combination sensor consisting of electromagnetic and eddy current probes is available for nonferrous metals and nonmagnetic stainless steel.