I also play guitar and ukulele and discovered my Snark tuner was not picking up the lower frequencies of the Bass reliably. I have a Behringer in-line tuner and it works just fine but I am not a pedal fan and so for home practice I just looked for an app for my Android phone.
I highly recommend the istrobosoft phone app, from Peterson, for iphone or Android, but would caution that although it works without the direct connection to the phone it works best with the interface cable and for $7 for the app + $40 for an irig2 interface I ended up with a great strobe tuner for a fraction of the cost of a standalone strobe tuner for hundreds of dollars.
Note: This was covered in a separate thread recently:
No, you do not need the amp to tune. I usually tune without the amp even being turned on
Hope this helps.