Quick question... I want to replace a ceiling light batten from current bayonet to E27. To feel comfortable enough to attempt this I want to test the voltage before getting up close and personal with the wires and a screwdriver. Is the 'pen' type of non-contact tester sufficient or is it worth going for a multimeter with dual probes? Not going to be doing a lot such work, maybe just the same type of thing in other rooms; never needed one before so I'm leaning toward the pen type as a simpler and slightly cheaper option. Can anyone shine a light (sorry!) on the subject please?