丈量員主要負責(i) 協助測量主任及/或土地測量師進行實地測量工作；(ii) 就實地測量工作負責預備、看管、保養及運送測量設備、工具和物料；(iii) 保持擺放測量器材的儲物間整齊清潔；以及(iv)協助訓練二級工人。 (註: 須不定時及在惡劣天氣環境下工作，須登上測量船以及在香港任何地方工作/紮營，當中包括陡峭、崎嶇的地勢和在海浪洶湧的情況下執行職務。)

A Chainman is mainly deployed on (i) assisting Survey Officers and/or Land Surveyors in carrying out surveying work in the field; (ii) undertaking the preparation, care, maintenance and transportation of survey equipment, tools and materials for field survey operations; (iii) maintaining the order and cleanliness of survey stores; and (iv) assisting in the training of Workmen II. (Note: May be required to work irregular hours and under inclement weather, work aboard survey vessels, and work and camp in any part of Hong Kong, including hilly and rugged area.)