This instrument adopts PID intelligent operating control ,thermocouple to sense temperature ,controlled silicon to control output ,single-button swiftly up and down temperature setting mode, setting ,controlling ,double line digital display ,with broken accidentally protecting function , when the required temperature is made already ,the microcomputer will adjust the temperature rise speed automatically according to the temperature difference . Achieve the best temperature rise effect by ratio adjustment and intermittent power-supply. Precision :±1℃,which is the ideal accurate heating temperature controller . Besides , II type add self adjustment function , when this function starts ,it can make temperature control temperature rise the most fast at the same condition . But you should readjust the instrument when heating temperature gets changed.