Hi-beat...

In a watch, the balance wheel swings to and fro on its own axis and acts as the ruling organ of the movement's escapement. The amplitude (usually about 300 degrees) is restricted by the balance spring, which also provides the reversing of the direction of rotation. The frequency of the alternating vibration is measured either in vibrations per hour (vph) or Hertz (Hz).

dead beat second
7,200 vph (1 Hz) = 1/2 second

low beat
18,000 vph (2.5 Hz) = 1/5 second
21,600 vph (3 Hz)= 1/6 second
28,800 vph (4 Hz) = 1/8 second

hi-beat
36,000 vph (5 Hz) = 1/10 second

Zenith El Primero 1/10 Foudroyante - 36,000 vph (5 Hz)
- www.zenith-watches.com

43,200 vph (6 Hz) = 1/12 second

Seiko ND58 - 43,200 vph (6 Hz) - www.seikowatches.com

72,000 vph (10 Hz) = 1/20 second

Breguet XXII - 72,000 vph (10 Hz) - www.breguet.com