There is a way in which HP5+ is demonstrably better, at least as of a few years ago. It has about 1/5 of the low intensity reciprocity failure. If you have an indicated reading of 100 seconds, HP5+ will need an additional 200 seconds while TX400 will need an additional 1000. These are not manufacturers propaganda, but the experimental results of Howard Bond who is about as meticulous as anyone I know of.
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Gadget Gainer
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