Tell me about flow meters for slurry applicators.........

We have not been using a flow meter for applying hog slurry.
For various reasons, we are going to start using one..........and therefore I need to get educated on them.

Preliminary inquiries with one dealer resulted in a price tag of 15,000 for display, meter, and the valve to keep flow even.

15,000??

Is that right? or is the guy playing on my ignorance?  Or, hopefully, did I misunderstand him?

What are used ones running--------or are they available?



Thanks.