1. Lithium-ion battery pack, providing longer running time and fast charging directly inside the device. 2. Small size, light weight and durable ABS case 3. Graphical liquid crystal display, large-screen liquid crystal display provides synchronous readings of all monitored gases. Graphical action icons display battery charge status, missing sensor conditions, and other relevant data. 4. Standard data recording function, the memory can record up to 50 hours of measured gas concentration data (black box), which can be downloaded by computer, which is convenient for operation management and accident responsibility determination. 5. Quick calibration, use Mcal to calibrate all sensors at the same time, saving time. Compared to standard calibration procedures, the device reduces the amount of gas required for each calibration.