Projected capacitance has an etching on the conductive layer which forms a grid pattern, allowing it to be more accurate and have a more flexible operation. The grid pattern on the conductive layer is either created by etching on a single conductive layer or by etching parallel lines on two separate perpendicular conductive layers. Since this type of capacitance has greater resolution, the touch panel can operate without direct contact, allowing it to be operable under screen protectors or other protective insulating layers. In addition to the human body, projected capacitance can also interact with an active or passive stylus. There are two different sensor types for projected capacitive touch panels: Mutual Capacitive and Self Capacitive. Mutual Capacitive sensors have a capacitor at every intersection, making the rows and columns operate dependently. Since a change in the capacitance can be detected at every individual point on the grid, the location of the touch can be measured more accurately. This allows for multi-touch operation since each touch location can be accurately tracked at the same time. Self-capacitive sensors can also be located at every intersection. However, the rows and columns operate independently from each other. When a conductor touches the panel, the capacitive load is measured by a current meter which produces a much stronger signal than mutual capacitance. However, ghosting is commonly seen with this type of sensor due to its difficulty in resolving accurately more than one touch.