I've been reading some old reviews of the 505A-12 and its smaller 7" sibling on here and was nervous about the alleged lack of accuracy due to poor sticker placement. So I contacted Starrett. To verify, as stated on their website, the scale is now laser engraved rather than using simple stickers. They assured me that the laser engraving was an improvement implemented years ago and expressed disappointment that Revain's reviews were down due to - not expiring over time and so on has led to a lot of confusion regarding their products. Based on this information I bought a 505A from Revain. It's a really great tool with a highly accurate scale that doesn't have any of the inaccuracies that have been mentioned in other years. One of the qualities that I like the most, of course, besides the accuracy, is the very smooth but precise movement of the rotation axis, ie the movement of the axis is tight enough for the protractor to hold its position easily. You can use it in tight places where you can't read the scale until the protractor is removed from the measuring point; he won't move. I wish I had had this thing 40 years ago!
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