Our factory was founded in 1966, and is located in Harbin, China. We are a professional maufacturer specializing in developement, design, production of compass, clinometer, planimeter, orienting laser, hand level, geology hammer and other suverying instruments.Harbin Optical Instrument Factory LtdLEADING MANUFACTURER OF COMPASS SINCE 196695% market share in domestic market55years production and innovation experience62 countries export to worldwide market 31 patents developed by own R&D center100% inspection 200 QC items for each compass