Up for your consideration is a used but in good condition Behringer BTR2000 rackmount chromatic tuner. Really useful and won't break the bank account. I love the built-in lights. It's really helpful in a rackcase rig. These run $100 new. Asking $65 shipped conus
Here are the factory specs:
Ultraflexible autochromatic 2-channel tuner with metronome and handy rack light.
The flexible Behringer BTR2000 2-Channel Rack Tuner and Metronome offers super-accurate tuning for electric and acoustic instruments. This multifunctional tuner with a built-in microphone offers 11 different tuner modes (chromatic, banjo, or open tunings). Choose between manual or automatic A-tone standard pitch calibration from 428Hz-452Hz in 1Hz increments, transposable by a maximum of ±7 semitones for especially flexible tuning. There are 2 separate input channels accessible via front and back connectors. In addition to the tuner capabilities, the BTR2000 features a useful metronome that's adjustable from 30-240BPM, with both an audible and a visual beat indicator. You can also work on-the-fly with the manual TAP tempo function. The integrated, switchable rack light with powerful LEDs gives you absolute control in dark places over the gear in your rack.
-Multifunctional tuner including built-in microphone
-Metronome is adjustable from 30-240BPM with audible and visual beat indicator
-Manual TAP tempo function
-Switchable rack light with high-power LEDs
-11 different tuner modes based on 12 equally tempered tones
-Manual or automatic A-tone standard pitch calibration from -428Hz-452Hz in 1Hz increments, transposable by a maximum of ±7 semitones
-Adjustable resolution of the LED bar (5 cent/LED vs. 1 cent/LED)
-2 separate input channels accessible via front and back -connectors
-Additional 1/4" TS output for metronome click/reference tone
-True hardware bypass for highest signal integrity between input and output
-Mute function for direct signal muting during tuning
Here are a couple stock photos: