Foxwell NT200E Manual page 12

4. Press the ENTER key to save measurement setting and return.
2.1.7 Adjusting Display Contrast
To adjust display contrast:
1. Use the UP/DOWN key to select Contrast from System Setup screen.
2. Press the ENTER key to confirm.
3. Use the UP/DOWN key to adjust contrast.
NT200E OBDII/EOBD Code Reader User's Guide_English Version_V1.0
System Setup
Language
Measurement Unit
Contrast
12