The Model LPI-4 loop-powered panel display features large 1 in. (2.54 cm) 3-1/2 digits. It is designed to display any 4-20 mA signal in desired scale as part of a building automation system, BAS, or HVAC application. The display panel is powered directly from the 4-20mA signal loop, so there is no need for a power supply for the black digit model. It is also available in a 24 Volt DC powered version with red, green, or amber digits.