A display apparatus includes a display panel, a needle module on the display panel, the needle module including an indicator needle rotatable with respect to a rotation axis, and a driving module to rotate the indicator needle via magnetic force.

A display apparatus includes a display panel, a needle module on the display panel, the needle module including an indicator needle rotatable with respect to a rotation axis, and a driving module to rotate the indicator needle via magnetic force.

A monitoring device is provided having a temperature-compensated pressure-measuring system, in which an electrical notification is output to the outside with use of a plurality of settable threshold values. Also, a high-performance switching system is provided that includes at least one monitoring device.