NEF30-MC digital meters constitute a development of the NEF30 series that has so far included control buttons, lamps and signal indicators. All NEF30-MC indicators feature the same characteristics: the possibility of installing in a standardised Ø 30.5mm hole, and a wide range of supply voltage – 24÷230V AC/DC. Their design has been coordinated with other devices of the NEF30 series. They have been adapted to be used together with NEF30 devices, as panel-mounted meters for industrial applications.[...]