100% complete machine patch, wave soldering, stable performance, good consistency. Embedded CPU chip (MCU), more intelligent, lower power consumption. Automatic power set memory (MCU built-in EEPROM memory unit). Control accuracy of 0.1 degrees Celsius. Have been tested for stability, consistency and reliability. Tips: - long press set to get menu, starts at P0 - press +/- to get next P-parameter - press set to choose that parameter - press +/- to select the value you want for that parameter - press set to accept it - long press +/- = reset to default - power-out does reset to default - default temp set is 34.5C