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Adrian Mariano
 
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(Marton Czebe) writes:

What do you people use as a reference straight edge? (preferably
something that stays straight for a while...iron, aluminium?)


I have a phenolic straight edge that I got because I was concerned
about the durability of aluminum (and the phenolic was affordable,
though not as cheap as other things discussed in this thread).
Subsequently the place I got it from (McMaster-Carr) has quit selling
phenolic straight edges. I wonder why?