Camera to read number plates

Hi

I am looking for a camera to read number plates of stationary cars from around 20m, I would to do this day and night but if there is a significant price difference daytime only will do.

I currently have some Hiwatch IPC-D140 2.8mm 4MP cameras, these do not appear to be capable of doing this.

They are connected to a QNAP NAS running the surveillance station software.

Any recommendations please?

Thanks


Karl