PowerRef 3 provides binocular, dynamic measurements of accommodation in sphere, convergence and pupil diameter changes in scotopic, mesopic and photopic conditions. It is an unique accommodation meter that is being used by scientists.
There are other auto refractors out there but they cannot compete with the Plusoptix customer service!
I am giving PlusOptix 10/10 on customer service. It is really refreshing to see (basically) a tech company get it right for a change.