Where can I buy an authentic compass to see Feng Shui in Tianjin?

Tianjin can go to China Ancient Culture Auspicious Goods Store (called Sock Hutong) at Unit 5 1-8 of Tianjin Ancient Culture Street Antique City. There should be a special big compass (from small to large, but I don't know if it is in stock), and the design is exquisite and accurate. You might as well go and have a look! Or call the store and ask: 022-2770470.