When changing the fork oil on my KZ750H3, first, a rough amount is poured down the forks and then the distance from the top of the inner tube to the oil level is measured. No matter what I use, be it a wooden dowl, a metal tube or whatever, it is difficult for me to see the actual oil level. Part of it may be my old eyes, but most oils are dyed a color, but when spread out thin, the coloring is nearly invisable. What tricks do folks here use to measure (see) it? I was thinking maybe paint whatever I use a flat white? Thanks!