I put the Lepsi app on the iPad and have a £4 demagnetiser, they seem to work, minimal outlay iPad shows magnetism present, a swift workout on the blue box then recheck and hey presto all good. AD has a big fancy demagnetiser that appears to work the same. Ships from the local dockyard sailed out over electrical cables on the river bed before going to sea in wartime, although they called it ‘degaussing’, similar process?
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