The meaning has been said on the balcony. I won't repeat it.
Starting with E, the terminals are arranged in three rows: short (connected with 5m line), medium (connected with 20m line) and long (connected with 40m line).
The 5m line is connected to the measured object, and the 20m line and 40m line are respectively connected with corresponding plugs. (It takes three points to approximate a straight line)
When measuring transmission towers, it is necessary to measure several points at the same time. Connect two E-terminal button wires to two tower feet respectively.
When measuring a single grounding body, such as grounding point and test point, short two E-terminal button wires on the instrument and connect them to the grounding body to be measured with a 5m wire.
In addition, the speed, scale, gear and reading of 120r/min should be needless to say.