Most product pages lead with one big number. It is usually accurate. The trouble is that it describes the best case, the biggest batch or the simplest setup, and your plan may sit somewhere else entirely.
A charger can deliver its full wattage to one port and much less when a second device joins. A rice cooker can list its maximum and stay quiet about its minimum. A printer can handle both sides of the output and still read only one side of the original. Each of these stories starts with a person who read the number correctly and still nearly bought the wrong thing.
How to spot it before you buy
- Ask which condition the headline number was measured under, and whether that is your condition.
- Look for the opposite limit. A maximum often hides a minimum, and a total often hides a per-port or per-mode split.
- Check whether two features you want are listed together in the same table row, not just somewhere on the same page.
- Read the paper size, batch size or device count your plan actually needs, then find that exact row in the manual.
The stories
Everyday tech
The Anker 735 Nano II A2667 gives a laptop on its top USB-C port a 45W maximum when a phone occupies the other USB-C port.
Tessa wanted one charger to live at the workbench so June could have her bag back. The Anker 735 says 65W until a phone joins the laptop.
Read Tessa's story 3 minIn the kitchen
Yes. The US Zojirushi NS-LGC05 supports half a supplied rice cup of uncooked short- or medium-grain white rice on WHITE RICE/MIXED, using the matching…
Olive wants a first rice cooker for small bowls of plain rice. The big number on the box is three cups. The number she needed was the minimum.
Read Olive's story 2 minEveryday tech
To copy both sides of loose originals automatically, look for a two-sided document feeder and a two-sided-to-two-sided copy mode.
Lena wanted both sides of her loose originals copied without flipping each sheet. “Duplex” on a printer listing only covers the printing half.
Read Lena's story 3 minEveryday tech
For black-and-white US Legal paper, choose the US Brother HL-L2460DW with supported plain paper. It can print both sides automatically.
Wren wanted long Legal puzzle sheets printed on both sides. The Epson takes Legal paper and prints duplex, just not both on the same sheet.
Read Wren's story 4 minEveryday tech
The US Fellowes AutoMax 100M has an automatic tray rated for up to 100 loose sheets and a manual slot rated for up to 10, using Letter 20 lb paper under the…
Wren wanted to load a whole stack instead of feeding a slot. The AutoMax 100M takes 100 sheets one way and only 10 the other.
Read Wren's story 3 minLife with pets
For a bowl that recognizes an enrolled cat, choose the SureFeed Microchip Pet Feeder MPF001, Standard Version.
Zoe was eyeing used SureFeed bowls before a possible second cat. One model opens for any pet that walks up, which would defeat the point.
Read Zoe's story 3 min