Can we trust our mains' power meters? (Patreon)

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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. My second channel: https://www.youtube.com/HB9BLAWireless Links: 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 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 Mini PC: https://s.click.aliexpress.com/e/_DBL0qr1 The links above usually are affiliate links that support the channel (no additional cost for you). Supporting Material and Blog Page: http://www.sensorsiot.org Github: https://www.github.com/sensorsiot My Patreon Page: https://www.patreon.com/AndreasSpiess Discord: https://discord.gg/JfgDSa8 If you want to support the channel, please use the links below to start your shopping. No additional charges for you, but I get a commission on your purchases to buy new stuff for the channel My Amazon.com shop: https://www.amazon.com/shop/andreasspiess For Banggood https://bit.ly/2jAQEf4 For AliExpress: http://bit.ly/2B0yTLL For Amazon.de: http://amzn.to/2r0ZCYI For Amazon UK: http://amzn.to/2mxBaJf For ebay.com: http://ebay.to/2DuYXBp https://www.facebook.com/profile.php?id=100013947273409 https://twitter.com/spiessa https://www.instructables.com/member/Andreas%20Spiess/ Please do not try to email me. This communication channel is reserved for my primary job As an Amazon Associate, I earn from qualifying purchases #no#midroll#ads