34172B Calibration Tool for Six and a Half Digit DMMs with Foolproof Design
30,41 €
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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