[Richard and Rhonda]

I use a neuro olafactory transmitter that is mounted in the space between my pie hole and my peepers. LOL, you asked for that one :-)

I would find the two probes in the tank and put a voltmeter across them. I don't have the odor control (cause mine don't stink, of course), so maybe someone who does can post a pic of the probes and their location on the tank. They should be located at the bottom of the tank, unlike the level probes that will run up the side of the tank.