Supplier: Compass, planimeter, clinometer harbin compass, top 1 in china 1) best sell compass 95% market share 2) famous brand with longest history since 1966 3) original source manufacturer for some global brands 4) longest exporting experience over 30years, 62 countries worldwide. 5) creater of national and industry standard for geological compass 6)technical research pionner with more than 30 technical patents