Heath Consultants GT Series - Manual (Page 95)

9-5
SNIFFER MODE
1. Press and hold - to enable visual only.
2. Press and hold again - to enable both audible and
visual.
9.5.6 Ticker (Geiger) Adjust
To adjust the Ticker (Geiger) threshold:
(after the Ticker (Geiger) feature has been enabled)
• Press the UP or DOWN buttons.
The threshold setting is displayed briefly beneath the PPM
CH
4
.
9.5.7 Menu / Off
To re-select the Mode Menu:
• Press and hold both the LH button and the RH
button .
When the menu appears on the screen, release
the buttons, otherwise the instrument will proceed
into the switch OFF process and will switch OFF
after a further three (3) seconds.