Check the classified ads for your local music store or news paper. The major advantage with chromatic tuners is that they are hands free. You can hit a note or string and it will show you what note you are playing and if it is sharp or flat. Excellent for practicing on a fret less bass. Works great for tuning down to E Flat.
Some tuners have only LED readouts.
Try to get one with a VU meter, the one with the needle. This is important for setting the intonation. Starting from a flat setting, tune up to the note until the tuner indicates you are in tune. Make sure you don't tune down to the note. If the note is sharp, loosen the string to make the pitch go lower and tune up to the note.