HYELEC MS8229 DMM Digital Multimeter Auto Range Noise Temperature Luminance Test Manual and automatic range. Convenient exchange makes your measurement more accurate. Relative value measurement function. In this mode, the instrument display value = actual value-set reference value. Large LCD screen with backlight can help the user see the data clearly even in the night. Auto power-off function. If there are no operations within 15 minutes as of the instrument is turned on, the instrument will automatically enter into sleep state.