FS:YVR orp controller/meter and Skimz Large Fluidized Reactor.
 

Bought recently,

Milwaukee MC510 orp controller, able to read negative numbers for reading biodenitrators or used to control an ozonizer. Built in relay outlet to control ozone optional.

Probe is used maybe 5 min. Back in storage solution that came with box.

I decided to go with a battery operated one. The one for sale has a 12v plug adapter and is meant to be on full time.

Asking $150

Also have a Large fluidized reactor from Skimz.(like new in box) Asking $175.
Converted another to a biodenitrator. 😊