由於 QR 碼過細關係，再加上各屏幕解像度不一，流動裝置根本法素描 QR碼。加上鏡頭距離、對焦等問題，根本無法識別三個定位圖案。

On what circumstances are you reading them?

On mobile devices, they are produced at a resolution of 225 x 225, which was good enough for our test devices.

可能佢無click入去，只係係條bar道掃，所以就掃唔到。

樓主是咪scan咗個個18x18既QR code link呀？