详细介绍: 型号         输入值            准确度 MB4501      DC0~1.9999V    +/-0.05%+3字         MB4502      DC1~5V         +/-0.2%+3字     MB4503      DC0~20mA       +/-0.2%+3字    MB4504      DC4~20mA       +/-0.2%+3字   
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