www.pcimag.com/articles/103539-shore-hardness-durometer-from-paul-n-gardner-co-inc

Shore Hardness Durometer from Paul N. Gardner Co. Inc.
June 1, 2017
PosiTector SHD Shore Hardnesss Durometer measures the indentation hardness of non-metallic materials. Two models are available for different hardness ranges, and an easy-to-read digital display has a reset feature to instantly restore factory settings. Visit www.gardco.com.