Is (2R,3S)-2,3-dichloropentane optically inactive?

Two confusing thing about (2⁠R,3⁠S)-2,3-dichloropentane:

1. The 2 stereocenters have opposite absolute configuration.
2. But there is no plane of symmetry.

So, is (2⁠R,3⁠S)-2,3-dichloropentane optically inactive?

(This is actually a follow-up question of:Monochlorination of 2-chloropentane and possible enantiomer products)