The ammeter lets you monitor current draw so you do not inadvertently connect too many devices.
Fuses are always good so you don't burn things out. This DIY multi-external hard drive power supply is fuse protected at the mains socket, has an LCD ammeter to monitor current draw, simple LED temperature indicator, and a temperature controlled fan. We could just get a 12V power supply that can provide more than enough wattage for the amount of drives in use and slap on a bunch of DC jacks, but we can do a bit better than that and add few features (but not too much where the project becomes unwieldy). One poster mentioned none are made because that would be a single point of failure but another rebuked that by saying a desktop PSU is essentially what you are looking for but not out of the box useable for our purposes. Most of the search results were people asking the same question.
I looked online for an out of the box solution but did not come across any that fit my needs. Do you use a bunch of 3.5" sized external hard drives that have their own wall wart power supplies? Don't you just hate that the wall warts take up soooooo much space on your power strip? Me too! That's why I made a 12V power supply to power my external hard drives.
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