Review on Swanson Tool Inc SWTL800M Magnetic by Aaron Urena

I don't know how this product gets good reviews. Swanson usually makes great products. My new level is not a level; learned it the hard way after hanging the shelf. Then I saw that the shelf was off. I compared my new Swanson spirit level to two other spirit levels and a leveling app on my iPhone. As far as I could tell, the other two layers and my iPhone matched. The Swanson horizontal spirit level, while having a central bubble, deviates from approximately 1/16 foot to 1/8 inch over an 18 inch length. I measured twice, drilled once. I had to use two tools twice to determine the true level. No quality control? To return.