Portable gas detectorIf used for too long, there will be measurement deviations in the sensors and reactants. It cannot guarantee the authenticity of its measurement results. So it is necessary to calibrate the portable gas detector. In the calibration method, the degree of range calibration is much higher than that of general calibration methods, but this calibration technique requires a considerable understanding in order to be applied freely. The calibration of the range can be quite easy or very complex and expensive, depending on the type and concentration range of the gas.