Wolf Garten Robo Scooter 1800 Operating Instructions Manual page 14

Planning Ahead
1.6.3 Distances from Edge (Pools, Ponds, Cliffs, etc.)
RoboRuler is used to measure the distance from the edge, where the
wire is to be placed.
In certain cases, near bodies of water such as pools and ponds, or
great height differences such as cliffs, it is required to maintain a
greater distance from the Edge (see Section 2.3).
Chapter 2 - Initial Setup
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