PZEM-008 AC 50-300V/100A Digital Display Voltmeter and Ammeter

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1. Backlight control
The backlight can be turned on or of by short press the key
2. Reset energy
Long press the key over 3 seconds until the energy data flash, then release the key, short press the key again to reset the energy, otherwise after 3 seconds it will stop flashing and the energy will not be reset.
3. Data storage
When the power off, the enrgy data and backlight status can be saved.