This lot includes a Simpson Model 651 DC VTVM Adapter made by Simpson Electric Company in the USA. The device is accompanied by its original manuals: "260 Add-A-Tester Adapter Operator's Manual" and "260 Series III Operator's Manual." Designed for use with the Simpson 260 models, this unit retains all wires and connectors shown, as well as its original box, though the packaging shows signs of wear.