Ask HN: Best sub-$100 life-changer buys?

french press. digital calipers. digital tape measure. non-contact thermometer. usb oscilloscope. high precision kitchen scales. metric kitchen utensils. digital torque gauge extensions.

I guess i'm more into metrology than I realized. Metrology and coffee, I suppose.

But that kind of equipment really does open doors in both cooking and engineering. A good pair of calipers essentially enabled my whole CAD background.

"Obvious" old geezer answer: Antibiotics, when I had a bad case of bacterial pneumonia.

Two things.

Wyze Cams, lets me check on things no matter where I am.

Corsi-Rosenthal box fan, the quality of air in my house vastly improved. No cooking smell, less dust, etc.