Here's how to winterize your metal detector. I happen to use Garrett, but you can utilize the same ideas and principals for whatever brand you use. All you really need are some old wool socks, some duck tape and some of those hot pacs, available at most outdoor sports stores.
ACE Series Detectors
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GTI/GTP Series Detectors[/center]
ACE Series Detectors
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GTI/GTP Series Detectors[/center]