See: HUDY

HUDY have introduced the new 70~140mm droop gauge for 1/8th and 1/10th off-road vehicles. CNC-machined from premium-quality aluminum, the gauge comes black coated and laser engraved engraved on both sides for quick check on both left and right side. The tool is designed to check the drop of the suspension down travel in range 70~140mm. Great for quick and instant droop check directly on ready-to-race car with no other set-up equipment needed, the gauge is inserted on the nut that holds the shock on the shock tower and using the ruler on the gauge measure the distance to the center of the screw that mounts the shock absorber to the suspension arm. To adjust the droop adjust the down stop screws as needed or adjust the length of the shock absorbers.