High-precision temperature and humidity measurements (optional configuration). Real-time detection or timing detection is supported; when no detection will be done, it is possible to shut down the pump so as to extend the startup time. Multiple alarm modes, and multi-directional and three-dimensional indication alarm states.It includes sound & light alarm, vibration alarm, display screen visual alarm.Alarm types include: concentration alarm, under-voltage alarm, and failure alarm. Multiple alarm mode settings: low alarm, high alarm, interval alarm, and weighted average alarm. Mis-operation recognition function: automatic recognition and prevention of the concentration calibration mis-operation, which is possible to avoid the poor performance that may be caused by human factors.