This package does not include batteries.
Due to new rules of China Post Air, parcels must not include batteries,
otherwise it will not get through the custom.
The tester uses neon lamps to indicate voltage produced on a fence line
or by a fence controller. It is designed for a low impedance and standard
duty fence controllers.
The specification of GK503B and GK503C is almost same,
the big difference between GK503B and GK503C is the measurement range.
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