Observable

Ob‐serv″a‐ble (?), a. [L. observabilis: cf. F. observable.] Worthy or capable of being observed; discernible; noticeable; remarkable. Sir. T. Browne.

The difference is sufficiently observable. Southey.

— Ob‐serv″a‐ble‐ness, n. — Ob‐serv″a‐bly, adv.