About This 24/7 Real-Time Monitoring & Alerts: Monitor pH, salinity, Temp, TDS and 3 parameters via kactoily app. Set custom ranges for each value and receive instant app alerts when levels go out of range. Never miss critical changes in your aquarium Universal Aquarium Compatibility: Featuring two versatile installation modes - fixed-mount and free-floating design, this probe effortlessly adapts to any fish tank Freedom to Monitor Anywhere: The probe and display connect seamlessly up to 980 ft away, giving you the flexibility to monitor outdoor fish tanks without restrictions Importance of ORP: ORP serves as a crucial indicator of water stability, safeguarding the health and vitality of your aquatic environment. The value of ORP and the values of ammonia and nitrite are inversely proportional, i.e., the higher the value of ORP, the lower the value of ammonia and nitrite Precision PH Calibration System: Includes 2 sealed packets each of pH 4.01, 6.86, and 9.18 calibration powders for triple-point calibration (industry-leading accuracy ±0.1 pH). EC solution excluded due to specialized shipping regulations. EC solutions sold separately