ampfixer
IF you have a tuner that wont let you tune down a half step there's a very easy work around. Capo your guitar on the first fret and tune to standard tuning. When you're done just take the capo off.
Then all you have to do is correct for however sharp the capo might have pulled each string.....
A chromatic tuner is a useful investment if you use multiple or unusual guitar tunings or capos. Not even a Shubb can be consistently fitted without pulling at least one string sharp sometimes.