Is a Kill a Watt safe to use with the GF?

Trying to understand electricity usage.

https://www.amazon.com/P3-P4400-Electricity-Usage-Monitor/dp/B00009MDBU/ref=sr_1_1?ie=UTF8&qid=1528577724&sr=8-1&keywords=kill+a+watt

Thanks!

I have used mine with no ill effect.

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