Smartphone Thermal Camera for iOS & Android with Visible Light Camera 256 x 192 IR Resolution 1000mAh Battery

SKU: GW41.0132

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It provides both Fahrenheit and Celsius units, you can choose the unit you need in the setting. 
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Yes, it is recommended to connect the phone directly to WI-FI, open the downloaded APP, and then record the video. 
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No, you can use the thermal camera separately or clip it onto your phone for your convenience, as long as they are connected via WiFi. 
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Depends on exactly what you want to do. Will it detect the location of a hot water pipe in a wall? sure. Would it detect a heavily loaded electrical wire? sure. Would it detect a low current wire or a cold water line? no. 
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If you have an Android phone, search for W01 on Google to download it. If you have an Apple phone, search W01 in the Apple App Store to download it.