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From the website: http://innovatehno.eu/products/

"The user (buyer) has to sign a contract, to not open the device for a period of 5 years, which is the period of warranty as well, that warranty...

"digital 'scope showing a sine wave really doesn't help"

This was also my first thought... an osilloscope is the wrong tool for this measurment. They should use an power meter or power analyzer....