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which device see through inside wall

I watched tv and i realize that i have no time to write down name of device that check out what is inside if there already have filter or not to prevent remove whole wall to check if nothing then install filter if already then put wall back that will take lot of works! would you tell me which device to check inside each row? thank

Re: which device see through inside wall

I'm going to guess you are talking about checking for insulation. Two choices come to mind.
1] A camera with a fiber optic lens, you can drill holes and slid the fiber optic lens in and see what's inside


2] An inferred camera the shows heat loose.

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