Review on Swanson Tool IBL240 Aluminum 24 Inch: Precision Measuring at its Best by Aaron Schultz

I use this brand for design evaluation because it has a good level of quality, accuracy and a good price. You can usually select two of these levels and they'll read the same, which isn't the case with other brands. I also like the double line bottles which are getting harder and harder to find. When using them for assessment, you can use lines to better define slopes and performance. I used to buy them locally, but my shop doesn't have them anymore.