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They sure seem to work or at least I have not had a problem. I have had mine for about 15 years. Once in awhile you should touch it to make sure it's still doing it's job. I placed mine toward the rear of my safe. They are worth the money. I have noticed that some of my stocks have loosened up a little but not sure if it due to the rod. I also have a humidity indicator in my safe but don't pay all that much attention after all these years.
Be Safe !!!
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