def chk_centigrade():
    """
    Provide hint for setting C/F preference (! key)
    """
    from x84.bbs import getterminal, getsession, echo
    session, term = getsession(), getterminal()
    echo(u'\r\n\r\n')
    echo(u'USiNG ')
    if session.user.get('centigrade', None):
        echo(term.yellow(u'Celcius'))
    else:
        echo(term.yellow(u'Fahrenheit'))
    echo(term.bold_black('...'))
