Is there an app to read temperature?

Chef's answer
Heaveen Thermometer is a great app to install on your Android devices, it's free to use and super easy to install and set up. All you'll need to do is calibrate the sensor to the outside air temperature and you're good to go. Be sure to follow the instructions for accurate readings.
Frequently asked Questions 🎓
The Android platform provides four sensors that let you monitor various environmental properties. You can use these sensors to monitor relative ambient humidity, illuminance, ambient pressure, and ambient temperature near an Android-powered device.
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