This product is the dynamometer controller for the vehicle or engine test system required for high accuracy and excellent operation. The detachable operation dial can be placed anywhere on the control desk. As a result, the operators hand and body posture are not necessarily fixed in a single position, reducing long-term strain on the operator. The shining, ring-like indicator shows both the degree of operation magnification and whether each dial is locked, giving the operator a complete overview of the testing situation. This feature also prevents operational error and improves working efficiency.