Blank Space in the Data Graph

Why is there a blank space in the data graph?

Causes and Troubleshooting:

To do that thing, you do this other thing.

1. Does the blank space correspond to a time when the Temperature or Humidity rose or fell quickly?

2. Does the blank space correspond to a time when the Temperature or Humidity fell below or rose above the scale limits on the screen

3. Were the AC power and back-up battery disconnected at the same time?

4. Try a wider vertical range setting or download the data to a PC. If there is still a gap in the data, try resetting the unit. If the problem continues, return for service.