I read something about inexpensive way h probes and can across this one. I wonder how accurate it would be. I'm temped to try it just to see
http://m.ebay.com/itm/BNC-Electrode...troller-Meter-Sensor-/262136738471?nav=SEARCH
http://m.ebay.com/itm/BNC-Electrode...troller-Meter-Sensor-/262136738471?nav=SEARCH