This tester is provided with a "Guard" terminal to prevent errors due to surface leakage. 本仪表装有保护环接线柱，用以纠正因表面漏电而造成的误差。
Apply a thin coating of petroleum jelly or chassis grease to the exposed surfaces of the cable terminal clamps and the battery terminal posts. 为电缆终端线夹和电池接线柱露出部分涂一层薄的凡士林油或车用底盘滑脂。
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