The MDM 15/21 break out box allows testing of signals on lines 1-21 of either 15 or 21 conductor MDM cables.
One side has pins and the other side has sockets so the box connects in-line with your cable.
Sheilded banana jacks accept either hooded plugs or standard banana plugs.
Line one is switched to allow current monitoring if desired as line 1 is usually the ground line.
Durable plastic case, strain-relieved cables, PCB construction for long life and reliability.