On screen symbols
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      Hour Glass On ToxCO

      Why does my ToxCO have an hour glass symbol?

      ToxCO-hourIf the device is zeroing before calibration, you should allow your device to zero in fresh air until the next screen is displayed.

      If the device is zeroing before taking a test then allow the device to zero in fresh air until the 15 second timer has started. 

      If the problem persists or has not been resolved by the information provided above, please contact Bedfont or your local distributor for more advice.