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Regarding the safety aspects of this product. The clues are all there to point to something you should not trust. When you purchase cheap imports (clue 1) especially manufactured in China (clue 2), you really don't know what you are getting. Even if it has a CE sticker/marking on the back, it...

For me, this topic is exhausted. My answer was aimed at DIYWell's original question. Yes it is possible to get an indication of the U value for a room using a USB interface card, which costs £40 and a bit of software. :-)

a complete waste of time??? I'm not asking you to do it and my time is my own to do whatever I want with it. I'm sure there will be things you do that I think is a complete waste of time. Why does someone climb a mountain????because it's there. Why do I do it....because I can. Don't take...

The gizmo is for measuring the thermal performance of a room I have insulated. I can calculate an equivalent of a U value. The U value is W/m2K. it is valid in a 3D structure. You get an measure of the REAL thermal transfer from inside to outside. I can measure the inside temp, the outside...

Despite all the 'helpful' comments, this is an extremely sensible question and very relevant. It is possible to calculate what could be called the U value of a room. The U values you get from tables for walls and floors are only a guide, but depending on the fabric of the house, they can be way...