- R137: 37 mm dia. x 37 mm long body
- S version: 4 mm, 1/8" or 1/4" dia Shaft
- B version: fits over user's 3 mm dia
shaft; includes flexible stator coupling
(tether mount)
- C version: fits over user's 3 mm dia
shaft; includes built-in flexible stator
coupling (tether mount)
- Up to 230,400 counts/rev (A quad B)
with internal electronics
