We don't have synonyms for perambulators yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are perambulator, perambulatory and perambulates.
(n) :
A surveyor's instrument for measuring distances, consisting of a wheel that rolls over the ground, along with a clockwork apparatus and a dial plate upon which the distance travelled is shown by an index.
(n) :
A surveyor's instrument for measuring distances, consisting of a wheel that rolls over the ground, along with a clockwork apparatus and a dial plate upon which the distance travelled is shown by an index.