I don't know. Plastic rulers never seem to have the metal strip; I guess they are "equal opportunity" rulers.
________________________________ From: Paul Trusten <[email protected]> To: U.S. Metric Association <[email protected]> Sent: Tue, July 5, 2011 12:22:54 PM Subject: [USMA:50812] metal guide on rulers sold in U.S. I have been on this particular watch for more than 30 years now: the metal guide on some dual-scale (millimeter-inch) rulers sold in the U.S. has almost always been placed on the inch scale, thus biasing the user away from metric as the preferred measurement system. This morning, I am in a local Walgreens, and now I see that wooden ruler being sold without any metal guide at all. This might have been just a cost-saving decision, but it did remove the old built-in bias against metric. Is this a trend? Paul Trusten Midland, Texas United States +1(432)528-7724 [email protected]
