These work fairly well, and don't waste space on your pedal board, $42.00
http://store.planetwaves.com/category/152540/Headstock_Tuner
I've been using one of these...
$30. Red if you're off. Green when it's in tune. Clip to the headstock. No need to have the bass volume on.
These clipons, IMO, are NOT good 'on stage' tuners. I have an Intellitouch and it is
useless once my bass starts vibrating from the pre-show DJ pumping crappy dance music or the guitarist warming up his tubes and fingers. Which is why I've been researching and searching for a pedal tuner for quite some time. I've been reading reviews here, other forums, on YouTube and magazines and testing them out in stores whenever I can find them.
Given MY needs, I've narrowed down my search to (in ascending order of preference) the TC Electronics' Polytune, Peterson Strobostomp 2, and the Turbo Tuner ST200.
Peterson is coming out with a new one this fall, the Stomp Classic. If it can match the speed and accuracy of the Turbo Tuner, I will buy it. If it does not, I'll get the Turbo Tuner even though I've yet to check it out in person.
I am on a budget, but I'm willing to scrimp and save to get the gear that works for me, especially a tuner -- I see it as a no compromise kind of necessity.
FYI: The Planet Waves was in the running, 'til I picked it up. Great canoe anchor, wouldn't want to weigh down my pedal board with it. The Strobostomp 2 is quite light.
Guitar Buyer had a regurgitation of tuner press releases in its June 2010 issue:
Planet Waves Tru-Strobe
Boss TU-3
Sonic Research ST-200 Turbo Tuner
Korg Pitchblack+
TC Electronic Polytune
Peterson Strobostomp 2
Morley AC-1 Accu-Tuner
Digitech Hardwire HT-2 Chromatic Tuner