WordNet sense 1 (readily perceived by the senses):

sensible

WordNet sense 2 (capable of being perceived especially by sight or hearing):

perceivable

WordNet sense 3 (can be felt by palpation):

palpable

WordNet sense 4 (capable of being perceived clearly):

discernible

WordNet sense 5 (capable of being detected):

detectable, noticeable

WordNet sense 6 (capable of being perceived by the senses or the mind; especially capable of being handled or touched or felt):

tangible