The gas detector calibration video will instruct the user to self-calibration of his or her gas detector when it is due or there are doubts about the accuracy.
Unlike other measuring devices, gas measuring equipment needs to be calibration more often, not once a year. As recommended by the manufacturer, the machine should be calibration at least once every 6 months. However, during the measurement process, depending on the degree of exposure or poisoning, the machine needs to be tested more often than recommended.
Videos of calibration of gas detector for reference only, can not replace reading the instructions that come with the machine.