Red Sea's SEAWATER REFRACTOMETER - offers exceptional accuracy, for measuring the absolute salinity of seawater at a temperature of 25oC/77 0F. Most refractometers are not specifically designed for reef aquariums. Thus, a measurement deviation of up to 1.5ppt is possible, which can have a significant adverse effect on coral growth and coloration.
Hikari Hydrometer: Wide Range Specific Gravity Meter For Marine Aquarium Use. Takes a more “true” water sample at a 6 inch depth avoiding inaccurate surface sampling with an auto-temperature correcting design. Designed for temperature-corrected reading in warm water aquariums – 68°F to 85°F with a Self-leveling, hanging device included.
Deep Blue Thermometer - Simple: This accurate thermometer is fully submersible into any fresh or saltwater aquarium for reading the temperature of your tank water. It adheres to your inside glass using a suction cup.
Deep Blue Thermometer - Digital: This accurate thermometer uses a wired probe to read temperature inside the aquarium with a digital easy to read display that can be stuck to your glass using a suction cup. The wired probe also has a suction cup that can be positioned inside the aquarium to help in keeping the probe in place.
Ammonia Alert Combo (Freshwater Only) By SeaChem uses Seachem sensor technology to continuously monitor ammonia & ph in your system. This Ammonia Alert Combo uses NO TESTS & NO STRIPS & can be used by Marine & Freshwater applications. The device detects less than 0.05 mg/L (ppm) free ammonia and alerts you to the #1 killer before any sign of stress. It...