The fastest and most accurate way to tune ukuleles is a digital tuner.
You will be able to see what note and how much you have to tighten / loosen to reach the perfect rhythm in each one.
It has a clip to put it on your Ukulele and with a single button you can select the instrument:
Just put it on the Ukulele and you will see that when you mark green on each of the strings it is ready! In less than a minute you already tuned it. It comes with a fairly durable clock-type battery, and in any case, easy to get.
LEARN TO TUNE YOUR UKULELE (click here)