The tuner in Flat for Education has been rebuilt around the instruments your students play.

• Instrument presets. Pick guitar, bass, ukulele, mandolin and more, including 7 and 8-string guitars, baritone ukulele, 5-string bass and mandola, and the tuner shows each string to tune. The free-pitch mode is now called Chromatic.
• Alternate tunings. Drop D, open tunings and other common alternatives are available for every fretted instrument, not only guitar.
• Reference notes. Play a string's pitch and tune by ear.
• Calibration and a precise readout. Set the reference pitch away from A = 440 Hz when an ensemble needs it, and read the deviation in cents next to the detected frequency. The redesigned meter keeps the target fixed and moves the indicator, and a history shows the last notes played.
• In the editor. The tuner also opens from the editor toolbar and preselects the instrument of the current part.

Find it under Tools, next to the metronome and tone generator, or read the practice tools guide.