your microCUBE has a default 'tuning fork' (A) there, but if you need per-string tuning, a tuner is a sensible acquisition relative to your gear list.
storage
if you are without a guitar bag/ stand, this is another sensible acquisition.
care kit
the crucial part in guitar lifespan- taking care of it. this isn't a vital consideration but having a polish cloth, string cleaning fluid & body wipe/ polish fluid helps.