metronoscope

me·tron·o·scope

(mĕ-tron'ō-skōp), A tachistoscopic apparatus that exposes at timed intervals short selections of printed matter for reading; used in testing and developing reading speed. [G. metron, measure, + skopeō, to view]

metronoscope

(mĕ-trŏn′ō-skōp) A device for exposing written material to the eye at timed intervals in order to facilitate development of reading skills and speed.