Custom Designed 34172B DMM Resistance Calibrator Compatible with Various Models
33,22 €
3: DIY 34172B four-wire short circuit has five pins. This design is a foolproof mode. Ordinary four-wire short circuit has only four pins, no foolproof, and it is easy to it in the wrong way. This kind will not be plugged in the wrong way, because if it is plugged in the wrong way, you can't it in at all.
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