RVFM Magnetic Electrical Connectors 5 Pairs

I used two pairs to interconnect my model railway boards; I use DCC so only 2 wires need to travel between boards. Works well - remember that they should be used in pairs.

I have found these devices very useful as a means of making mechanical connections to steel masses in various physics experiments. MagTags can be used to connect an oscillating soft iron core situated within a solenoid. Two springs Mag Tagged to the top and bottom of a cylindrical iron or steel core are clamped at the top and connected to a vibration generator on the bench below. By threading the mass through a coil and connecting the vibration generator to a signal generator the movement of a mechanical system can be converted to an electrical output and thus monitored by an oscilloscope as the vibrating springs, magnets, mass combination oscillates inside the hollow coil. At one particular frequency the mass will resonate with a large amplitude. Changing the mass will alter the resonant frequency. MagTags can be used for making a simple single axis seismometer using a similar method of employing a coil / mass on a spring responding to the bench being thumped.They are also good in replacing the weak magnet in the Worcester current balance kit

(This is experience of a very similar product from another supplier, hope that's OK here) Do remember to heatsink the wire during soldering, e.g. using a pair of pliers. I trashed the first one with soldering heat - magnet badly weakened.