In this "Age of Technology", there is no reason why a student can not have loads of helpful material, right at their finger tips. Here are some apps for your smartphones and/or tablets, many of them free!!!
The Tonal Energy Tuner is my favorite tuner app...it has all the bells and whistles you could ever want in a tuner, plus a metronome built in. Tuning, volume, articulation, release, duration, and steadiness are the key elements of developing a beautiful tone quality. Tonal Energy Tuner is the first multi-purpose application that allows users of all ages to understand and improve every aspect of their sound.