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* [[Media:U-Tech 681 682 & 683 Manual with Patent & Bio.pdf|U-Tech 681, 682, and 683 Manual with Patent and Bio]] | * [[Media:U-Tech 681 682 & 683 Manual with Patent & Bio.pdf|U-Tech 681, 682, and 683 Manual with Patent and Bio]] | ||
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The '''U-Tech 681''' is a transistor/diode curve tracer plug-in for [[560-series scopes]], introduced around 1968. Sister model [[U-Tech 682]] is the same for [[500-series scopes]], and there was a standalone model 683. | The '''U-Tech 681''' is a transistor/diode curve tracer plug-in for [[560-series scopes]], introduced around 1968. Sister model [[U-Tech 682]] is the same for [[500-series scopes]], and there was a standalone model 683. | ||