The instrument should be calibrated in an area free of vibration or stray magnetic fields such as power lines, generators, or welding equipment.

仪器校准应在无振动区域以及无发电机，焊接设备等干扰磁场的区域进行。

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What does the new gas-free motor technology mean for portable outdoor power equipment?

FORBES: Outdoor Power Equipment Goes Gas-Free: Makes Way To Wind Energy

No bilateral free-trade agreement exists, and India often flirts with slapping duties on Chinese imports, most recently of power equipment.

ECONOMIST: India and China