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Short press the key once to turn the backlight on or off.

PZEM-051 DC Digital Multi-Function Meter - Instruction Manual peacefair pzem-051 manual

: You won't lose your cumulative energy (Wh) data during a blackout. Cons DC Only : Cannot be used for AC household circuits. Short press the key once to turn the backlight on or off

If your meter isn't working, consult this troubleshooting section before assuming the unit is broken. peacefair pzem-051 manual