EHX used to make a tuner. A music store I worked for in college (just over 20 years ago!) had one. I wish I had bought it when I saw it, as I’ve never seen another one! It was, of course, the coolest tuner I’ve ever seen. Rather than reading out in pitches, it gave you a numerical readout of the fundamental frequency of the pitch you played into it. Play the low A on your bass, and tune it to 55 and you’re there. Of course, you need to know the frequencies of the pitches you want to tune to, but it was perfect for doing your intonation: just check the frequency of the open string, and adjust the bridge saddle until the frequency at the 12th fret is exactly double that number.

I’ve always wanted one.