I've tried many different tuners in my nearly 50 years of playing stringed instruments. I've settled on these Snarks (several versions available). A great value, accurate, and easy to use/see.
I am glad they improved upon the design of the Snark tuner. It seems to be more durable than my previous ones, and the digital face is easy to read.
This tuner is super simple to use and very accurate. I use it on my mountain dulcimer by clipping it onto a peg.