Icon Description
WLAN signal strength 75%
WLAN signal strength 50%
WLAN signal strength 25%
Data connection to the Testo Cloud exists, icon flashes: Data
connection to the Testo Cloud being established
Alarm message
Measurement channel 1
Measurement channel 2
Alarm status: upper limit value exceeded
Alarm status: lower limit value undershot
6.4.3 LED display – configuration
LED display Description
Online data logger gives a short (200
ms) green flash every 30 seconds.
Online data logger is in standby mode, there is
no configuration stored in the online data
logger yet.
Online data logger flashes green at one-
second intervals.
Online data logger is in configuration mode
and can be configured within 5 minutes after
activation.
Online data logger gives 3 long red
flashes after configuration.
SSID/account ID is not correct.
Online data logger gives 1 long (1 sec.)
red flashes.
Online data logger was not configured within 5
minutes.
Online data logger gives 2 long red
flashes after configuration.
Online data logger is not connected to the
access point.
Online data logger gives 2 short green
flashes.
Configuration was successful, online data
logger is connected to the Cloud and is
switching to measuring mode.