ECOTEST MKS-05 TERRA-P+ Operating Manual page 45

Simultaneously press and release the MODE and THRESHOLD buttons once
again to switch audio signaling on. An "Aud" symbol that briefly appears on the
digital LCD indicates that audio signaling is switched on.
Audio signaling is switched on automatically along with the dosimeter.
Note. Audio alarm of exceeded programmed threshold levels is independent of
the system condition of audio signaling of registered gamma quanta or beta-particles.
6.3.11 Switching display backlight on/off
At pressing any button of the dosimeter or changing the operating mode the
display backlight is switched on for 5 seconds. Press shortly the THRESHOLD
button to switch the dosimeter display backlight on without changing the operating
mode. The display backlight will switch off automatically in 5 seconds.
45