Turn on the microphone and play an open string, bowed or pizzicato: the tuner recognizes the string and tells you whether to tighten or loosen it. Tap a string to hear its note.
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Automatic string detection. Tap a string to hear it and select it.
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Tuning a cello
The cello is tuned in fifths, like the viola but an octave lower. Tune the 1st string, the highest, first, then work your way down string by string.
Low strings vibrate slowly: let them ring for a second or two with a steady bow, without pressing too hard, so the tuner can measure them accurately.