What does each button do?

• used to add a new item
  
  
• used to return to the previous screen
  
  
• used to cancel the current action
  
  
• used to copy an existing reading to a new reading
  
  
• used to start the delete process
  
  
• used to open the filtering, the color also tells you that not filtering is active
  
  
• used to open the filtering, the color also tells you that filtering is active
  
  
• use to hide the on screen keyboard
  
  
• used to complete the delete, clear or reset process
  
  
• used to save changes
  
  
• used to select all rows in the list
  
  
• used to start the report export process
  
  
• used to show the main navigation menu