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Buy a small multimeter, They are cheap. The only two functions you will need are VDC and ohms. The tube has good tutorials how to use it. heres one on Evilbay for a tenner[URL unfurl="true"]https://www.ebay.co.uk/itm/403881666599?hash=item5e09392827:g0kAAOSwkaxkWOln&amdata=enc%3AAQAIAAAA4AgPQ4e9NwD8dlkP3cKpU9nevhYZiBFamjW2roXxf6efZSDy2g1%2F%2Fwdvtk3pdaLfRs1vw3kFNiyGnwmdXPcSoUwkb2CxPF9Iyx14%2BLeJhKoHUtyPqBzA1bL0I0oTwOdgqUWYJKZWRx7oAiy7%2B1aq0unUIFNbptEzDIqD0haE19HrX6yGOl2XEl5AilMe1cn7eQCzbphDi079EDZ%2BZGBmkEHDUhQdyUeNTvldvAFbRL56Q%2FGNBJv38wrf%2BvQZ4xZnlF3gloHo6yrxsZR8fase8k%2BOBHOvXW%2BnnKF8fNpDuK2z%7Ctkp%3ABk9SR9zbudXuYg[/URL]
Buy a small multimeter, They are cheap. The only two functions you will need are VDC and ohms. The tube has good tutorials how to use it. heres one on Evilbay for a tenner
[URL unfurl="true"]https://www.ebay.co.uk/itm/403881666599?hash=item5e09392827:g0kAAOSwkaxkWOln&amdata=enc%3AAQAIAAAA4AgPQ4e9NwD8dlkP3cKpU9nevhYZiBFamjW2roXxf6efZSDy2g1%2F%2Fwdvtk3pdaLfRs1vw3kFNiyGnwmdXPcSoUwkb2CxPF9Iyx14%2BLeJhKoHUtyPqBzA1bL0I0oTwOdgqUWYJKZWRx7oAiy7%2B1aq0unUIFNbptEzDIqD0haE19HrX6yGOl2XEl5AilMe1cn7eQCzbphDi079EDZ%2BZGBmkEHDUhQdyUeNTvldvAFbRL56Q%2FGNBJv38wrf%2BvQZ4xZnlF3gloHo6yrxsZR8fase8k%2BOBHOvXW%2BnnKF8fNpDuK2z%7Ctkp%3ABk9SR9zbudXuYg[/URL]