Gotta push back on that a bit. Sure, a bubble level works fine for a picture frame, but they fall apart on anything serious. Try using one on an uneven surface or for a critical angle, and that big bubble leaves way too much room for error. My digital angle finder gives me a precise number every single time, and the app on my phone is just as accurate for quick checks. For actual precision work, trusting a vague bubble feels like guessing.