As part of my interests in studying changes in ceramic technology I purchased a Wilson Rockwell Dual Hardness Tester off of ebay (see photo below). This instrument provides precise hardness measures and because it is a "superficial hardness" tester (as well as Rockwell B and C scales), it can be used to study ceramics. A reasonable discussion of the use of this instrument can be found in Simon and Coglhan 1998 article in American Antiquity: The Use of Indentation Testing to Obtain Precise Hardness Measurements from Prehistoric Pottery . This can also be used for lithics and it will interested to integrate this work with the work Tim and I have been doing on measurement of fracture surface.
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