Note link just below if you don't get an answer. My home page magazine articles, lectures. Anders Ansar, Kungsholms Str. Modified September 2000. You are visitor number 600 since October 1997.
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Based on Silva model Apparent card diameter mm. Heel limit deg. With inclinometer, illumination. I may be able to offer a bit lower prices. Look at the side way view of the basic compass at Silva's site , and you may get an idea of what it looks like.