丈量員主要職責是－ (a) 協助測量主任或土地測量師職系人員進行實地測量； (b) 備妥、保管、保養和運送測量儀器、工具和物品，以便進行實地測量； (c) 保持測量設備儲存室整潔；以及 (d) 協助訓練二級工人。 (獲取錄的申請人可能須不定時工作，以及須於交通繁忙、崎嶇或高低不平的地方和惡劣天氣情況下進行戶外工作。)

A Chainman is mainly deployed on – (a) assisting members of Survey Officer or Land Surveyor grades to carry out survey work in the field; (b) undertaking the preparation, care, maintenance and transportation of survey equipment, tools and materials for field survey operations; (c) maintaining the order and cleanliness of the survey store; and (d) assisting in the training of Workman II. (Selected candidates may be required to work irregular hours and work outdoor in heavy traffic, hilly or rugged areas and in inclement weather conditions.)