求翻译：使用前检查机壳和配件,不要使用机壳损坏的仪表，查看是否有裂痕或缺少塑胶件，请特别注意表笔及连接线的绝缘层。是什么意思？

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Before using the shell and accessories, do not use the dashboard shell damage to see whether there are any cracks or missing plastic table pen, please pay special attention and cable insulation.

Before the use inspects the cabinet and the fitting, do not have to use the measuring appliance which the cabinet damages, examined whether has the fissure or lacks the revertex, please specially pour the beyond expectation pen and the ties insulating layer.

Check before use case and accessories, do not use casing damaged instruments, see if there are any cracks or missing plastic parts, close attention to the table and the insulation of the connector.

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