Final answer:
The two most useful instruments invented by the Chinese during the Han dynasty were paper and the compass.
Step-by-step explanation:
The two most useful instruments invented by the Chinese during the Han dynasty were the paper and the compass.
The invention of paper revolutionized communication and recordkeeping, allowing for the widespread dissemination of information and the development of a literate society. It was a significant advancement compared to other writing materials used at the time, such as bamboo strips and silk.
The compass played a crucial role in navigation and cartography. Its ability to indicate the direction of magnetic north revolutionized travel and exploration, allowing for more accurate mapping of territories and the ability to navigate long distances.