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Title: Flawed concept
Review: Warmth from window affects thermometer! D'oh! It's totally inaccurate on single-pane glazing, very inaccurate on dual-pane glazing, and still slightly inaccurate when mounted on a jerri-rigged 6" extender from dual-pane glass. The nature of windows being a big source of heat loss means this thermometer is measuring *warm* ambient air, not actual outside temperature.
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