I'm just messing wit ya. No way I can hold even close to a tolerance of 5 one hundred thou or even measure or cut it accurately. Picture this, although the human hair varies in diameter, generally lets just say it's about 3 thousandths of an inch (.003"). 5 one hundred thousandths (.00005) would be 1/60th of a human hair!
My micrometer can read down to 5 one hundred thou but measuring anything under 1 thou accurately needs to be done in a climate controlled environment with certified calibrated equipment. Shooting for a couple thou tolerance is good enough for me.
I really like that Incra rule. I have the cheap smaller version of it. Now you got me started, these are rulers I use the most when it's not maching related.