... display, it can choose the background colour and wave color acoording to the environment. And the LCD brightness also can be set freely ... enough to record the defect information.Rectification: Positive half wave, negative halfwave, full wave, and RF:DB Step: 0dB, 0.1 dB, 2dB ... , 6dB step value as well as auto-gain modeALARM Alarm with sound and ...