The device is specially designed for long term monitoring the pH value, salinity value, and temperature of water in fish tank or aquariums. Features: Multifunctional Water Quality Analysis Device: for 24 hours real time monitoring the pH value and salinity value of the fish tank or aquariums. Compact and Easy to Install: easily hanging the water quality monitor device on the fish tank by the included brackets or fixing it on the wall via the hanging hole. It also equipped with 2 suction cups for fixing the electrode on the fish tank wall. pH Value Measuring: 0.00~14.00pH measurement range, 0.01pH resolution, and ±0.1pH accuracy. Salinity Value Measuring: 0~199.9ppt measurement range, 0.1ppt resolution, and ±2%F.S accuracy. Reliable Quality: high sensitivity electrode probe smart chip for fastly and accurately measurement, and 2 LCD screens with blue backlight for displaying the pH value and salinity value clearly. Wide Applications: perfect for seawater, horticultural and hydroponics