def current_to_signal(raw_in, scaling):
    """
    Scales the input signal from current 4 - 20 mA to the human readable measurements.
    :param raw_in: current value.
    :param scaling: scaling constants.
    :return: signal value.
    """
    result = raw_in - scaling.RAWMIN
    result *= (scaling.EUMAX - scaling.EUMIN) / (scaling.RAWMAX - scaling.RAWMIN)
    result += scaling.EUMIN
    return result