The Metrohm 6.2103.130 is a highly specialized electrical laboratory accessory: a Black 2 mm Plug to 4 mm Socket Adapter.
In analytical chemistry labs, it is a critical small component used to bridge differing connection standards. Specifically, it allows a standard 4 mm "Plug B" (banana plug)—which is commonly found on traditional lab electrodes, ground wires, or temperature sensors—to connect cleanly into the smaller 2 mm input sockets on the back of Metrohm instruments (such as the 826 pH Mobile, 827 pH Lab, or Titrando titration modules).
| Attribute | Technical Specification |
| Manufacturer | Metrohm (Made in Switzerland) |
| Part Number | 6.2103.130 |
| Type | Diagnostic / Electrode Plug Adapter |
| Color Code | Black |
| Male End (Plug) | 2 mm |
| Female End (Socket) | 4 mm (Standard Banana Socket) |
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