Deleting a sensor in the iOS app can be done without deleting the Grow Room. Simply go to the Sensors tab and find the sensor you'd like to delete. Once identified, click on any of the graphs for that sensor. In the example below we'll click on the Temperature graph although you can click on any graph you'd like.
Next, click on the pencil icon found in the top right corner of the screen.
Finally, click on the trash can icon in the top right corner of the screen and confirm that you'd like to delete the sensor. Once deleted, your sensor's history will be deleted as well so please be sure you would like to do this before clicking delete.