Apex Neptune Dissolved Oxygen Probe The Apex Neptune Oxygen Probe allows you to efficiently monitor dissolved oxygen levels within your aquatic water. The probe enhances the conditions within your tank water by detecting any abnormally low levels. Oxygen levels with aquariums are key to sustaining health, vitality and life throughout your tank inhabitants. The probe developed by experts at Apex Neptune can highlight low levels, thus giving the hobbyist an ideal opportunity to fix these levels before it becomes detrimental to life within the aquarium. The Apex Neptune Dissolved Oxygen Probe has been developed using only the finest in materials to offer precision, efficiency and longevity. The probe is an improved replacement for old Oxygen probes and alternatively makes for an ideal additional probe for hobbyists adding other aquarium systems to their set-up. At a Glance: Efficient monitoring of dissolved oxygen levels with your aquarium water Small compact device Helps to enhance the conditions within your tank Highlights dangerously low levels Prevents levels becoming detrimental to fish health and vitality this preventing loss of life Developed using high quality materials to promise durability and robustness