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Some products are gambles secondhand. Others are durable, repairable, and steeply discounted the moment the box is opened. These are our picks in the second category. New to used-condition shopping? Start with the Conditions Guide, then set up a watchlist so a deal finds you.

Five Things You Should Never Buy Used

We run a site about buying used, so believe us when we say: skip these five categories. Helmets, car seats, mattresses, earbuds, and groomers.

Used Cast Iron Is a Cheat Code (If You Check Two Things)

Rust washes off. Cracks don't. Why a used Lodge skillet is one of the safest secondhand buys in the kitchen, and the two checks that matter.

Buying a Used Kindle Paperwhite: The One Thing to Check First

A used Kindle Paperwhite is one of the best e-reader deals around, but only if the previous owner deregistered it. Here's what to check before you buy.

Buying a Used Herman Miller Aeron: Sizes, Sag, and the Warranty Catch

The used Aeron market is huge and the discounts are real. What the A/B/C sizes mean, what wears out, and why the 12-year warranty doesn't come with it.

Used DeWalt 20V Drill Kits: The Batteries Are the Real Product

A used DeWalt 20V MAX drill kit can be a genuine bargain, but the drill isn't the part that wears out. What to check about batteries, chuck, and kit contents.

Baratza Encore: Why It's One of the Best Things to Buy Used

The Baratza Encore burr grinder is built to be repaired, holds its value, and shows up used constantly. What to check before buying one secondhand.