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If you plan to travel to Europe more than once, I personally would buy a travel hair straightener and travel hair dryer.
They are super cheap, like $15.
The voltage converters never work properly and can damage your electronics so better to have a dedicated device for Europe.
amzn.to
Amazon.com : Wavytalk Mini Flat Iron 0.7 Inch Ceramic Small Hair Straightener for Short Hair, Curls Bangs, Travel, Dual Voltage Flat Iron : Beauty & Personal Care