Same word as ultraprecise:

authentic, careful, close, concrete, correct, defined, definite, deft, detailed, discriminating, discriminative, distinct, exact, explicit, factual, faithful, genuine, judicious, just, literal, matter-of-fact, methodical, meticulous, on the button, on the money, on the nose, particular, proper, punctilious, punctual, regular, right, rigid, rigorous, scientific, scrupulous, severe, sharp, skillful, solid, specific, strict, systematic, true, ultraprecise, unerring, unmistakable, veracious