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During zero calibration, the display shows the summation of the zero gas O2 value plus the present background level and previous background level, correct?

April 26, 2017calibration display Gas O2 Plus PRESENT shows summation value Zero

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During zero calibration, the display shows the summation of the zero gas O2 value plus the present background level and previous background level, correct?

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Not really. In Zero Calibration Mode, the unit display the value of the background current of the sensor as expressed as O2 units. (i.e. 75ppb of background current, 100 ppb of background current, etc).