Ruide Theodolite RT-2 - 4.3 Sector Beep; 4.4 Angle Unit

is close to 0°, 90°, 180°and 270°. Press ▲, ▼ (HOLD, V/%) to shift
different options, and then press SET to confirm the setting. A sign of
BEEP will show on screen.
Beep Off Beep On
4.4 Angle Unit
3 units of angle: dms, gon, mil. Press ▲, ▼ (HOLD, V/%) to shift different
options, and then press SET to confirm the setting.
dms mil
gon