DaCapo 2.2

the author of this app says:

This keeps the beat for you with regular metronome functions, Italian speed names, a bpm display, adjustable tuning pitch and a visual indicator.

Accents can be set at different intervals to emulate meters like 3/4 or 7/8. You can make measure groupings like a 12 measure blues form.

This has big buttons, hard key mapping and great graphic layout.