1 Portable Anemometer
If need to take a spontaneous reading of the local wind speed and direction, but you only have your iPhone, this little device might be your best bet. It’s a pocket-sized anemometer (a term for a wind-reading instrument) that can connect to a headphone jack.
Of course, there are some practical applications for such a device. It can be used for taking wind readings for water sports, target shooting, or even for drone piloting or traditional flying. Just remember to buy an adapter if you have an iPhone 7 or newer. Buy it on Amazon for around $35.