I have two sets of litermeter3. One with RPM Module, the authored with WXM which works the same as the RPM if used without the sensor. Also each set has the overflow control module. Going in a different direction with my build and need to sell this. Selling both for $500.00. This will also include an extra Litermeter 3 unit that can be used for parts or sent in for service to Spectrapure and It'll be as new. If bought separate the G6 LM# with RPM module and Overflow control is $300.00. The second Litermeter3 not sure which generation it is which comes with WXM module and Overflow module it'll be $250.00 LM3 for parts $50.00. All prices OBO. PM with any questions.