Asklemmy

Years ago I bought an angle grinder from Aldi, for about 20,-. After 30 min it started to smell and the enclosure started to melt. I brought ist back still warm and smelling burnt in order to recieve my refund. Although I knew it couldn't be of good quality I expected it to last a little bit longer. If you buy cheap you buy twice.

Burger king chicken sandwich with foot lettuce

A wireless logitech mouse for gaming from back when wireless technology for periferals still meant a decent amount of latency. I learned quickly why latency is important when gaming. Also the precission of the mouse was terrible as it would regularly skip backwards under slightly accelerated movements. It was pretty humbling for me as a ~15 year old kid to realize I wasted around 4 weeks of newspaper work money on a mouse which I gave up on almost the same day as I bought it.

A replacement PCV valve for my car.

Car was around 100,000 miles, figured it was a good time to do a big refresh & replace a bunch of stuff. Spark plugs, belts & hoses, fuel & air filters, fluids, etc etc... While I was at the parts store, guy suggested I also replace the PCV valve. But, it turned out the only one he had in stock was the store brand. $4, sure whatever. Got it home, took the factory one off the car, and sure enough it was gummed up kinda bad. But went to put the new one on, and it just about collapsed in my hands. It was so flimsy, kinda like a drinking straw. Ended up cleaning the factory one & putting it back on, threw the new one away.

I did buy a number of fake flash drives, so they're definitely up there. Luckily I've always won the disputes and got my money back from every one of them.

There were also a number of headphones whose sound was so fucking bad, listening to stuff off my phone's speakers was better

There's probably worse, but off the top of my head, a Sandisk Curzer Fit USB 3.0 drive. It would overheat about 15 seconds into a file transfer and throttle to well below USB 2.0 speeds, perhaps even USB 1.1. I tried to alleviate the issue by using it through a USB 2.0 extender (thereby ruining its entire appeal to compactness), but it developed bad sectors soon enough. It was satisfying smashing it to bits with a hammer though.

My Muller hand mixer was designed to break.

Feit light bulbs aren't worth it for any price less than free.

Quip was pretty awful compared to Sonicare.

I purchased sunglasses in the Philippines and they broke the same day. I purchased a different pair from a different stand and they broke the same day. Im convinced the defective bottom of the barrel get dumped onto the Philippines

Those Dollar Store umbrellas! They are so shit they will break if the slightest bit of wind hits them, or maybe the flimsy metal frame breaks from closing it.

Sure it's from the Dollar Store, but I've bought lots of things from there that have last a decent around of time.

We got gifted a plastic rack for garden utensils. My mother in law bought it for us from the local supermarket (which has various cheap crap every week). Anyway, we placed a few items in it and it broke in a day. Utterly useless.

Can I nominate an airline?

Just about anything by Betterware. The one that sticks in my mind was the non-stick stick-on hook that lasted for all of a minute before falling off under its own weight. I ended up second guessing how the thing they were selling could possibly go wrong, and if I could think of something then I wouldn't get it.

There is one Betterware item that's lasted the years though. A hair trap for the sink. It's a metal disk with holes punched in it. Hard for that not to work, really.

Also, increasingly, tat off Scamazon.

Coors

I bought a harbor freight heat gun. All I'll use it for is lighting charcoal. Very uneven heat, and will melt itself if you don't turn it nozzle up when you turn it off.

Edit: I misread the question. I thought it was "lowest quality product that you still use" (I was distracted)

Original comment: Harbor freight calipers. Surprisingly still accurate and undamaged through years of abuse. Kind of amazing, and shockingly useful.

Barely working solar charger

A donair from Pizza 73

probably not the lowest quality, but an allarm clock from walmart that sheared/tore off the prongs from its plug leaving them in the outlet. (to have some charity I was putting significant strain on it)