What is a precision tension spring

What is a precision spring? First of all, we should make clear the concept of tension spring
Tension spring: it is the abbreviation of tension spring. It is generally made of round wire rod, which is machined by spring and wound into a spring with certain stretch force. General tension spring, both ends are provided with tension hook. Precision tension spring, on the basis of tension spring, has smaller dimension tolerance than general requirements, more precise, more stable and uniform tension, so as to meet the requirements of use
Precision spring is widely used in hardware, plastic, electronics, electrical appliances, fixture, gift decoration and so on