Here's how to change your Purezone measurement time:

iPhone

1. Launch the Purezone app
2. Tap the gear icon Settings in the upper right-hand corner
3. Select Measurement Time
4. Under Set Measure Time - Measure Frequency select either "Every Other Day" or "Every Day" - Note:  When "Every day" is selected, the cassette will only last for 48 days.
5. Under "Measure Time" tap the time indicator, i.e. 03:00 AM
6. Tap the clock
7. Use your finger to revolve the clock dial (Android) or scroll the dial up or down (iOS)
8. Select the measurement time by choosing the desired hour and minute setting
9. When the desired time appears, select AM or PM
10. Tap OK when the time appears correctly
11. 
12. Scroll down and tap Save
13. "Measure Time Updated - Measure time has been updated successfully.  It will take up to one hour for the results to be reflected on your Purezone device.  
14. Tap OK