No need for preheating, no need for a mask to measure; 4.3-inch color touch screen, Chinese menu; Long life LED light source, stable performance, accurate measurement results; The measurement process is simple and fast, the selection of supporting prefabricated reagents and built-in curves can be directly measured to support SD card expansion, data export, data storage and other functions; Supports two power supply modes: internal lithium battery and external power adapter.