Prokit's Industries MT-4018 - Manual (Page 7)

The meaning of the symbols represented by the
following：
1. Analog bar
2. UNDER indication to high range
3. OVER indication to low range
4. Display zone
5. Auto mode
6. Manual mode
7. Sound unit: dB
8. Indication to low voltage of the batteries
■. Operation instruction
1. Press button On/Off , the meter starts auto-range
measuring after the screen displays all the LCD
segments. symbol AUTO displays and the micro-
controller selects a proper range to measure sound
automatically. The range is displayed on top of the
screen. Analog bar and digits indicate the value of
Sound to be measured. If symbol UNDER or
OVER appears, it means that environmental sound