Can someone make a recommendation for an ORP probe model that is fairly reliable and compatible with neptune apex? Anything under $250 for the probe price point is acceptable.
I have two ORP probe styles, giving dramatically different readings in the tank water. Both reading within +-20mv of 400mv american marine solution when tested in solution. Not calibrated.
1) neptune apex probe with glass membrane covering the tip. (one year of service. Several years old.) reading 350mv
2) milwaukee ma921 lab grade double junction orp probe. (5 years old in original probe storage container. 1 day of service.) reading 120mv.
Attempting to run ozone for water clarity and help managing red slime algae. Phosphate and phosphorus register zero. Nitrate registers 10 ppm. Using hanna checkers. Would like to have three probes running to validate readings, one probe running on second controller. Trying to avoid ozone related catastrophe.
I have two ORP probe styles, giving dramatically different readings in the tank water. Both reading within +-20mv of 400mv american marine solution when tested in solution. Not calibrated.
1) neptune apex probe with glass membrane covering the tip. (one year of service. Several years old.) reading 350mv
2) milwaukee ma921 lab grade double junction orp probe. (5 years old in original probe storage container. 1 day of service.) reading 120mv.
Attempting to run ozone for water clarity and help managing red slime algae. Phosphate and phosphorus register zero. Nitrate registers 10 ppm. Using hanna checkers. Would like to have three probes running to validate readings, one probe running on second controller. Trying to avoid ozone related catastrophe.