Turning the IQ Force On The warning alarm levels screen will then be shown followed by the danger, STEL, and TWA alarm levels screens. For more information concerning STEL and TWA alarms, see Section and Section After the alarm screens, the calibration due screen will be shown with the number of days until the next calibration. The instrument will then proceed to the current gas readings screen. If calibration is due, Cal due now will be shown followed by needs cal. The user will need to acknowledge the message by pressing the MODE button. Once the MODE button is pressed, the IQ Force will continue to the current gas readings screen and the appropriate calibration due icon will blink every five seconds and the red light will flash to remind the user that the instrument is past due for calibration. If the Bump Test Interval setting is enabled, the bump interval screen will be shown. The bump due status will be shown in days or hours.