The Aquarino DO/SAT Kit is complete so you can monitor the Dissolved Oxygen in your aquarium water. 
 
 The SAT/DO reading interface and the   probe (electrode) of  Dissolved oxygen

 Totally plug-in-play, just plug in and you'll be reading the data in real time. Remember to calibrate the interface after installation so that your data is accurate.
 
 Aquarino's probes are laboratory quality, that is, the best for monitoring and caring for your aquarium. 
 
 Electrolyte fluid must be replaced annually.