But in all seriousness, if you are looking for a good guitar tuner, a lot of the ones on the market are actually not very good.
I highly recommend TC Electronic for clip-on tuner, or Sonic Research or Peterson for pedal tuners.
source: playing guitar for 32 years
The low b on my 5 string bass is often identified as an f by electric tuners.
They also just aren't very accurate when they do detect the right note. I've never used a tuner where my cello is actually in tune when it says it is, always requires tweaking.
The most popular tuner of all time is the BOSS pedal, and the LED lights are too far part from eachother, it's simply not granular enough to really get in tune to my ears.
Stroboscopic tuners are the way to go