Rated only on build quality and type Technology. Well built. feels heavy Of course, I can't judge whether this works. It is advertised as gas discharge, which is GOOD TECHNOLOGY compared to diodes. Replaceable cartridge. Another commenter found a replacement. (Again, how do you know if it needs replacing. I think if you know you've had a strike you can replace it just in case.) This is NOT a scam. This applies to most if not all gas discharge protection devices.
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