Years ago I never heard of a depth gauge device. Always changed the fork oil with out it before. It worked for me before. So if the seals go out and yes I have to change the seals I will probably go and get the correct tool. Then I will feel more like Bill Nye the Science Guy. Sorry may have gotten his name wrong, ha, ha. .... The tool is cool and I am sure it helps to measure much more to spec.
Buckeye, Arizona(USA) 2011 Victory Cross Roads, Black police bag guards, black engine guards, black handle bars, Triumph Tiger mirrors, Triumph hand grips, set speedo/tach back 5" , adjustable timing wheel, Lloyzz Fuel Programmer III & air filter. Modified exhaust, made stock into 2 into 1. MRA windshield, Rotated front fender forward,relocated ignition switch, Bad Ace Fuel Tank Risers, Fat front tire.