I have 2 [MH-Z19](https://www.winsen-sensor.com/d/files/infrared-gas-sensor/mh-z19b-co2-ver1_0.pdf) for measuring indoor CO2 calibration. One is running permanently on a Raspberry Pi, the other one on an Arduino Pro Micro on a handheld device that is turned on only when I want to measure.

The specs say that the MH-Z19 is auto-calibrating every 24 hours. That feature can be turned off and it can be calibrated by sending a zero-point calibration command.

Does this zero-point calibration (400 ppm) survive powering off the MH-Z19 on the Arduino?