def METHOD_NAME(size):
    """Convert the size returned from _get_pos_units into a physical unit."""
    if size >= 0.050 and size < 0.500:
        unit = "m"
        sf = 1
    elif size >= 0.50 and size < 5:
        unit = "dm"
        sf = 10
    elif size >= 5 and size < 50:
        unit = "cm"
        sf = 100
    elif size >= 50 and size < 500:
        unit = "mm"
        sf = 1000
    else:
        unit = "unknown"
        sf = 1
    return unit, sf