Review on 📏 Precision Leveled Stability: Circular Bubble Spirit Level Tripod by Christopher Bacho

I have compared it to a 0.05mm/m machine leveled surface and about 5 grades were very good, 4 were decent enough and only 1 was unacceptably bad. I marked the bottom half of the best ones for everyday use and kept the other good ones as backups and threw away the rest. Considering how low the cost was, I'm glad I have 5 useful mini-levels. A good product.