TESA WS2900C-PRO - Install Rain Gauge; Install Batteries

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Figure 5 Figure 6
5.2.4 Install Rain Gauge
Keep the Indication mark in straight line. As show below photo.
5.2.5 Install Batteries
Insert 2XAA batteries in the battery compartment. The LED indicator on
the back of the transmitter will turn on for four seconds and normally
flash once every 16 seconds (the sensor transmission update period).