เครื่องตรวจจับรังสีแม่เหล็กไฟฟ้า 5-in-1 รุ่น VT-ER3 และการทดสอบสนามไฟฟ้า พร้อมการวัดอุณหภูมิและความชื้น สีดำ-A23U

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