Oasis OH-31 HT Humidity and Temperature Tracker for iPhone:
Bluetooth Humidity/Temperature sensor with free iPhone app.
No need to open your instrument case to see the humidity/temperature readings. You can view the information on your iPhone. Android version will be available at a later date.
Once you have downloaded the App, place the sensor on the iPhone screen and press the + sign on the upper right corner of the screen to sync with the App.
Set humidity/temperature limits and your smartphone will alert you if the readings are too high or low. The App can read up to 7 sensors and has a transmission range of over 100 feet.
The App keeps track of your long-term humidity and temperature data by day, week, month and year. The data can be downloaded to your computer.
Sensor comes with clip, so you can attach it to your instrument case.
You will be notified of App updates automatically.