I know I will probably go down fighting on this issue but why rely on an external mechanical device at all?
I nearly wore out a small tape recorder checking on my intonation, spending more time starting, stopping and listening to it than actually playing. I was still very unconfident about pitch, not trusting my own ears or more importantly my own mind.
It was not until I took an old veteran's advice and studied the underlying structure of scales and arpeggios that I began to pre-hear the notes coming towards me as I played.
Below is a copy of my post in an earlier thread -
"I tend to agree with PaulCannon above in that using a tuner for all notes is mostly for the beginner. A cheap little Chinese watch-sized clip-on electronic tuner will do this well. Even then ASAP go over into aural training and tuning the bass by harmonics.
Most people can clearly hear a 5th, Octave and 10th based on the open D as tonic, either alternating between D and the other note or playing them as double stops.
Many other TB members believe in playing scales to D as a drone. I don't! The electronic drone or tuner, like the strobe tuner, is an external crutch (support) that I react to, rather than being pushed hard enough to pre-hear and aim for the notes that I am about to play.
I would rather carefully hear the scale as two tetrachords, the basic building blocks of a structure (Scale comes from the Italian word Scala, meaning Ladder) that is confidently applied to any chosen tonic note. Each group has the intervals Tone Tone 1/2 Tone with a Tone in the middle between groups. Pause slightly between each group and repeat octaves. This creates more "landings" in the long "flight of stairs" called the Major scale over three octaves and makes it much easier to stay in tune throughout. Set aside a quiet time to examine placing the two middle notes E and F sharp in between D and G, then B and C sharp between A and octave D. Try doing this in the dark to heighten your senses. Then repeat the process for the adjacent E flat scale, then any scale, then both forms of minor scales, then arpeggios. Pre-hear notes coming just as though you are aiming darts to hit a bullseye every time.
The level of intonation you can achieve in your practice alone at home might be called Absolute Pitch. As soon as you play with someone else you need good Relative Pitch, because for any number of reasons you have to be able to adjust your tuning quickly and accurately. The piano can't adjust to you so tune your open strings to the same-name notes piano around the middle of the keyboard. Try to play duets, trios, quartets with other bassists and instruments, and chamber music where you are the only bass. This will boost your confidence in smaller musical settings.
(taken from the thread USING A STROBE TUNER posted by rumblejohn on 03 - 21 - 2011)
Best wishes,
DP