Shore durometer "durometer" (ISV "duro-" and "-meter"; attested since the 19th century), but today that name usually refers to Shore hardness; other devices use other measures, which return corresponding results, such as for Rockwell hardness. There are several scales of durometer, used for materials with different properties. The two most common scales, using slightly different measurement systems, are the ASTM D2240 type A and type D scales. The A scale is for softer ones, while the D scale is for harder ones. However, the ASTM D2240-00 testing standard calls for a total of 12 scales, depending on the intended use: types A,
Michigan Shore-to-Shore Trail Michigan Shore-to-Shore Trail The Michigan Shore-to-Shore Trail (also known as the Michigan Riding and Hiking Trail) is a trail that runs between Empire on Lake Michigan and Oscoda on Lake Huron across the Lower Peninsula of Michigan. It is open to horseback riders and hikers but not bicycles. The trail's western end is located within the Sleeping Bear Dunes National Lakeshore. The trail, going from west to east, travels through the Boardman River valley and follows the Au Sable River for about . The trail was developed by trail riders in 1962 and travels through mixed hardwood and conifer forests.