Pre war Deckungswinkelmesser marked JDEM J.D. Möller
Deckungswinkelmesser or Indirect fire calculator made by J.D. Möller G.m.b.H., Wedel. This little device helps to calculate distances and hight differences in terrain. This tool was a issue piece in the mapcase and very hard to find. The Duckungswinkelmesser is in very good condition.