Word Study
self-registering
CIDE DICTIONARY
self-registering, a.
Registering itself; -- said of any instrument so contrived as to record its own indications of phenomena, whether continuously or at stated times, as at the maxima and minima of variations; as, a self-registering anemometer or barometer. [1913 Webster]
OXFORD DICTIONARY
self-registering, adj. (of a scientific instrument etc.) automatically registering its measurements.
For further exploring for "self-registering" in Webster Dictionary Online