We were asked in class to find out what one of the several perception tests on the front table were. The one I chose was hard to find any information on, but after looking up Lafayette Instrument Co. I found that the pictures below are discrimination weights. They are used to test perception of pressure sensitivity. They come in two sets, light and heavy, which both have two series of twelve weights in them. The light set ranges from 75 to 125 grams and the Heavy st ranges from 175 to 225 grams.
SOURCE:http://www.lafayettelifesciences.com/product_detail.asp?ItemID=76
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