This device is made for measuring air temperature, air humidity, soil moisture and light intensity and can be usefull in gathering data for a plant environemnt.
The measuring unit it's based on Arduino Uno and it transmits data to a mobile phone using a HC-05 bluetooth module. For getting the data I used a DHT22 sensor, a soil moisture sensor and a simple LDR photoresistor.
For receiving data you can use Blueserial app or Serial Bluetooth Terminal. I used the last one. It's easy to use and has a pretty good interface.