445 Can we trust our mains' power meters?

Can we trust our mains' power meters? And how efficient are the power supplies of our gadgets? Essential questions if you want to optimize your electricity bill. Let’s have a closer look.

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Metrahit Energy: https://secure.reichelt.com/ch/de/multimeter-metrahit-energy-digital-60000-counts-trms-metrahit-energy-p114371.html
KWS-AC300: https://s.click.aliexpress.com/e/_DdP1ad5
KWS-AC301: https://s.click.aliexpress.com/e/_DFsL3Vp
Modbus information for the KWS-AC301: https://github.com/SensorsIot/KWS-AC301
Sonoff POW Elite: https://s.click.aliexpress.com/e/_DmfWjJz
Shelly 2PM plus: https://amzn.to/3G9zLmh or https://ebay.us/IMyn72
Tuya Zigbee: https://s.click.aliexpress.com/e/_DcHRdW7
DIN Rail mounted: https://s.click.aliexpress.com/e/_DFRDqv9
Current probe Micsig CP2100a: https://s.click.aliexpress.com/e/_DEdnDQx or https://amzn.to/3FBAICi
Differential Probe.Micsig DP20003: https://s.click.aliexpress.com/e/_DdmuFO7 or https://amzn.to/3V7CMYv
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