This is an oil level adjustment tool for precise suspension settings. It can also be used for inverted forks. How to use: (1) Bottom out the inner tube and pour slightly more fork oil than the specified amount. (2) Insert the gauge (stainless steel rod) into the inner tube, aligning it with the specified oil level height. (3) Remove excess oil with the syringe on the main unit. The point where the oil is completely removed is the oil level set by the gauge. Product Specifications: Syringe Capacity: 60ml Level Gauge: 0-300mm