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It is more of a safety device than an alignment aid. Useful for smaller transformerless sets, all-american five radios, etc. Not needed for items with a power transformer. It is also only good for 200 watts, so check the rating on the device you'll be powering with it.
Note that this will only protect you from one of many ways that you can get zapped working on electronics, especially tube-type electronics, and more especially TV sets. Don't think that you're immune to being shocked just because you are using an isolation transformer.
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