Although this spirit level has an inexpensive look and construction the bubbles are REALLY easy to read. I don't know if I would use it if I were a pro; The walls feel like they are slightly dented. But perfect for the handyman! I settled on the sturdy 24 inch size that I use the most. It seems more reliable but is twice as expensive. If you're a casual user like me, the easy-to-see vials outweigh the simple build.