Unverified copies often omit the critical calibration sequence (usually holding the SET button while powering on). If you skip calibration due to a bad manual, your voltage and current readings will be wildly inaccurate.
IP68 (Rain/Hand washing). Not suitable for hot showers or saunas Bluetooth Version 5.3 (typical for current ZY models) 3. Common Troubleshooting zy8068 manual pdf verified
The verified manual explicitly states (Section 1.3): "Installation only by qualified electrical personnel. Disconnect all power before servicing." zy8068 manual pdf verified