Mastech MAS345 - B;L Button

the LCD. Press the button again for more than 1 second will come back the auto-range
mode.
When the R-H button is pushed, voltage ranges will change as:
4V → 40V → 400V → 1000V
Or resistance ranges change as:
40MΩ → 4MΩ → 400kΩ → 40kΩ → 4kΩ → 400Ω
2.4 B/L BUTTON
Press this button to toggle back-lit ON. The screen of the meter will light. Press the
button again, back-lit turn off.
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