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The second light (GREEN) detectslow-level EMF. ---The fourth light (orange) can detectadvanced EMF. >1 x EMF Magnetic Field Detector (Battery is included). It is easy to always bring along since it fits in your pocket or purse!
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.