You will certainly need a tuner and a metronome. You can try this app: "Cadenza: Tuner + Metronome"
[color=#282828][font=helvetica, arial, sans-serif]Seems to work pretty well. And it has a [size=4]h[/size][/font][/color][size=4][color=#000000][font=Helvetica]igh degree of accuracy.[/font][/color][/size]