Measuring land slides of a steep slope near Shatin Pass Road from more than 500 metres away on the roof of Ching On House of Tsz Ching Estate using TOPCON GPT-7501 Long-range Non-prism Total Station by Highways Department of Hong Kong SAR on 25 July 2008. Every points required was successfully measured without using prism.

Successfully tested measuring to a wet dark brick more than 100 metres away using GPT-7501 (along Cheung Yip Street outside Highways Department’s depot on 25th July 2008)