Indication of continuous measurement (current signal 4-20 mA) of a production process as:

• Filling level
• Flow rate and filling quantities
• pH-values
• etc.
  by vertically arranged LEDs.
  It is used where a short overview about the relevant data of a production
  process is sufficient. The change from red to green allows a quick optical
  detection of the measured value and thus a rapid possibility to react.