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Double Bass Clip on tuner ?

A trick I learned from the old-timers when tuning pizzicato is to pluck the string above the left hand(between the hand and the nut) while touching the harmonic A- a nice clear note comes out, the same note as below the left hand but clearer and easier to hear- goes great with the tuning fork:).
I confirm this. This works best when the left hand plays the harmonics in the first octave (rather than in thumb position).

Hein van de Geyn recommends to play harmonics in this way in his book on jazz double bass.

I do it frequently harmonics (not only for tuning), unless it is really inconvenient. As a bonus, it looks like bass wizzardry to the puzzled audience.
 
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Most frequently however, I use the tuner only to tune the D string, and then tune the other strings relative to each other by using the harmonics at "frets" 5 and 7. The "error" with respect to equal temperament for the open G (2 cents flat), A (2 cents sharp) and E (4 cents sharp) is minimal, and for the fingered notes, it is irrelevant.
Tuner questions aside; absolutely, 110% this! ^
Your ears don't need batteries, don't need to be visible outdoors, and can't be forgotten at home.

As a bit of an ear training exercise I'll set a drone to an open string and try to match pitch before tuning the other three strings with harmonics. Then I check myself by playing octaves across sets of strings (I.E. comparing the open D string to the D on the G string as well as comparing the G on the D string to the open G).
 
The TC Unitune / Polytune are the best clip on tuners I’ve tried for bass. Only ones to reliably track low E /B strings consistently. I’d save the $ and just get the unitune as the Polytune feature is pretty useless on bass.

I had no idea that the Unitune existed. $20 cheaper and does it all. I always thought that "strumming your open guitar" tuning was silly and never tried that mode. I'll be sure to mention the Unitune to the next person who tries mine and wants one of their own. Thanks
 
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This is a tuner I bought recently from one our dependable online bass shops:
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It is billed by D’Addario specifically as a “cello/double bass” tuner. Works fine on all strings, just sensitive enough.
 
For the E string, use the 12th fret harmonic. As long as your profession intonation is set, that will be fine for the clip on tuner

Even if your intonation is set wrong you still can use the 12th fret harmonic to tune. The harmonic is always tuned exactly an octave higher, no matter what. If your have a faulty intonation set up it will also be there if you tune with a open string. So there is no difference.
 
Do yourself a favor and get a Peterson Strobo HD clip on tuner. I have used the Boss TU-12H and I thought I will never buy a new tuner. The Peterson has a sweet spot setting that sort of tempers the tuning. I use it for both electric and bowed double bass and I have never been surer about my tuning. It is a bit of an adjustment visually but once you get used to it.......my TU 12H is collecting dust. Nuff said.