No, the meter needs to have power supplied to it’s USB C port, either by a USB power supply or a USB Powerbank. If no USB power is connected, then it will stop working as soon as its internal batteries are flat, after about 72 hours.
For this reason, we also sell USB Powerbanks that are large enough to last for more than 7 days. https://greenenergysolutions.co.za/power-banks/