TH0104 is a set of dc voltage reference standards, consisting of four TH0100 DC Voltage Reference Standards that are electrically and mechanically completely independent of each other, as well as a cabinet.

The dc voltage reference standards can be used to calibrate precision DC voltage instruments such as high precision digital voltmeters and voltage sources standard. It has the characteristics of high stability, high accuracy, high-drive capability,low temperature-drift,small size for easy portability.

It is especially suitable for maintaining the traceability of national standards, and transferring the standard voltage to provincial and municipal metrology institutes, electric power research institutes, metrology stations at all levels, and enterprise metrology laboratories.