The Official FYSTEC Belt Tension Tool is designed for 3D printers and supplied in a size as shown.
 
This Belt Elastic Tensiometer, made from Aluminum Alloy, assists in ensuring the correct tension of the 2GT belt, maintaining optimal performance of your 3D printer.  The digital gauge provides precise measurements for easy adjustments.
 
Originating from Mainland China, this tool is specifically manufactured for 3D printer maintenance, catering to the needs of users seeking efficient belt tension control.