You can do without, but it is useful, if you aren't that good at tuning by ear. My electro-acoustic guitar has a tuner built into it. I wouldn't call myself a m

You can do without, but it is useful, if you aren't that good at tuning by ear. My electro-acoustic guitar has a tuner built into it. I wouldn't call myself a musician, the precision of my hearing is dubious and since I practice rarely, I tend to use it each time. Otherwise I'd spend 5 minutes each time trying to get it sound right and then redoing it after playing something, because I didn't get it fully right and I realise it once I play something I'm familiar with.