在測繪處工作的丈量員，其主要職責包括(a)協助測量主任及／或土地測量師進行實地測量工作；(b)利用小型測量設備／工具執行實地測量工作；(c)就實地測量工作負責預備、看管、保養、維修、運送及保護測量設備、工具和物料；(d)保持擺放測量器材的儲存間整齊清潔；以及(e)協助訓練二級工人。 (註：丈量員或須(i)不定時工作；以及(ii)在交通繁忙、崎嶇起伏的地區和惡劣的天氣情況下擔任戶外工作。)

A Chainman in the Survey and Mapping Office is mainly deployed on (a) assisting Survey Officers and/or Land Surveyors in carrying out surveying work in the field; (b) using of minor survey equipment/tools for execution of surveying tasks in the field; (c) undertaking the preparation, care, repair and maintenance, transportation and safeguard of survey equipment, tools and materials for field survey operations; (d) maintaining the order and cleanliness of survey stores; and (e) assisting in the training of Workmen II. (Note : A Chainman may be required to (i) work irregular hours; and (ii) work outdoor in heavy traffic, hilly or rugged areas and in inclement weather conditions.)