Are you still worried about the inability of 3D printer belts to accurately measure tension? Are you still feeling sad about the lack of intuitive spectrum measurement for tension? This belt tension measuring instrument can fully meet your needs! Intuitive display of numerical values, simple and convenient operation, faster and more reliable! Upgraded construction, can adapt to smaller detection space, compatible with 95% of 3D printers. More information: 2GT-6MM belt tension calibration reference value is about 8.0 2GT-9MM belt tension calibration reference value is about 9.0 K1 belt tension calibration reference value is about 7.8~8.0 K1 MAX belt tension calibration reference value is about 7.7~7.9 Colour:Red Material:Plastic Package Contents: 1 * Belt Elastic Tensiometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.