The tuner captures audio from your microphone and uses autocorrelation to detect the fundamental frequency. It then shows the closest musical note and how many cents sharp or flat you are.
Standard tuning reference is A4 = 440Hz. Covers notes from C2 (65Hz) to C7 (2093Hz).
Any instrument that produces sustained pitch within 65-2093Hz.
Yes, the tuner uses your mic input.
1/100th of a semitone. ±5 cents is in tune.
Default is A4=440Hz, adjustable.
Yes, no limits.