You probably don’t need a test lens kit.

Unless, you know … you want one.  

Or you’re dealing with a vexingly complex diopter scenario you’re trying to untangle, and you couldn’t friendly-bribe a local optometrist into sharing their kit.

Either way, you probably want to do a little bit of at-home calibrating:

As always, this is deeply, profoundly unprofessional advice.  You do with all this as you like.

Either way though, do go make some 20/20 gains!