Is this a good high converting offer?

I was thinking about a free offer to send a tester to potential customers. In my area the houses are very old, built in the early to mid 1900's. A high percentage of these houses have missing grounds, revered polarity, or no GFCI protection in the kitchen or bathroom- all things these testers could warn people of. Then they could call me to fix it
Maybe I could get a small company sticker made and put it right on the tester.Giving these testers away for free could become expensive, is there a way to qualify people first? Or is this just a bad idea altogether?
David Hunter | Duke of Marketing
www.DukeOfMarketing.com
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