This aluminum straight edge is an economical alternative to other much more expensive straight edges on the market. Reference edge is machined flat to within 0.001" over the entire length. They are available in four different lengths.
Really excellent reference straight-edge. Excellent machining, good ergonomics on the handling side, good protection provided by what looks like powder-coat on the handling (non-reference) surfaces. Shipping tube doubles as a safe-storage location. Vinyl end-guards are worth saving to protect the ends from drops. Made in Taiwan, which explains the excellent quality at the value price.