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Meredith Dietz is Lifehacker’s Senior Staff Writer. She earned her bachelor’s degree in English and Communications from Northeastern University, where she graduated as valedictorian of her college.

The Renpho Elis 1 Smart Scale has racked up over 54,000 five-star reviews on Amazon, and right now you can get it for under $20 thanks to October Prime Day. That’s a steal for a device that syncs with ...