While practicing my ukulele I began to notice the strings were becoming out of tune. I am lucky enough to have a sister who play's guitar and used her electric tuner shown on the left. For those without a tuner there are tons of apps that you can download onto your phone or tablet unfortunately I do not own an iPhone or iPad so I can not speak for the mac products as for android I can help point you in the right direction. One app that I have found useful was the easy ukulele-ukulele tuner you can download the app for free from the google play store it's easy to use. You can use this app to tune each individual string it uses a chromatic tuning setting making it easy to tune for those of us that are not classically trained in music. If you feel like getting a tuner I would suggest going down to a local music shop or guitar center (they will tune it for you) and pick up an electric tuner they are easy to use and most store will show you how if you do not already. Below is a great Youtube video on how to tune your Ukulele while he uses a fancy tuner the same principles apply to other tuners as well. Happy tuning Ukuers