Hasselt's Goby (Asia Pacific) Nutrition Neptune ORP Probe is a

Neptune ORP Probe is a double-junction oxidation-reduction potential probe for compatible Neptune Apex aquarium controller systems

and handle the magnets carefully to avoid pinching fingers or placing the cleaner near electronics

or exchanges

making it the best fit when a wider aquarium needs more moonlight coverage

Measurement use: Oxidation-reduction potential monitoring

Hasselt's Goby (Asia Pacific) Nutrition Neptune ORP Probe is aThe Hasselts goby is a unique and interesting fish. It is also called the flap head goby after its oversized pectoral fins which it fans in front of its face in a flapping motion. It tends to do this strange behavior every few seconds making it quite entertaining to watch. Its fawn colored body is adorned in coffee colored stripes and bands with jagged edges, and an even darker spot is on the upper edge of its caudal fin. Males and females are