A stretch spring (also known as a tension spring, or tension spring for short) is a spiral spring that withstands axial tension. A stretch spring is usually made of a circular section. When not under load, the stretch spring between the coil and the coil is generally and tight there is no clearance.

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1) According to the free length of the test spring, lift seat 6 to the appropriate position (that is, the measured spring can be placed between two pressure plates or between two hooks), and fix it on the column 12 with a small hand handle.

2) Put the spring under test on the pressure plate or hang it between the two hooks. Press "P clear /1" to remove the dead weight of the spring.

3) Pull the operating handle 7 so that the upper pressure plate and the spring are in contact. Press the "F clear /0" button to make all the displacement digital tubes zero.

4) Continue to pull the operating handle 7 to add force to the measured spring. When the displacement displayed by the displacement digital tube reaches the deformation of the spring, the force value displayed by the digital tube is the test force value of the measured spring.