Features:  The WiFi online pH salinity controller allows you to real time monitor the pH and salinity via your smartphone on the Tuya APP(for free), it is compatible with ios and Android system, perfect for 24 hours online monitoring.  Widely used to test the pH / Temperature / salinity of water.  With relay output power socket, you can control the pH & salinity value according to your requirements.  You can replace the fuse easily and fast with external replacement. Detachable and replaceable pH  electrode.  With dual power plug for air outlet stone, ozone generators, oxygen pumps, carbon dioxide regulators, solenoid valves and other control devices.  Easy calibration of pH/salinity with just a mini-screwdriver and automatic temperature compensation.  Clear LCD with backlight, 3 results displayed simultaneously. Easy to use and provide instant display of results.  Test temperature in & 8451; / & 8457;(switchable units) and can online monitor and control ORP & salinity for a long time.  Apply in water sources, soil-free growing, aquarium, hydroponics, laboratory, spas, environment water, swimming pools, water purification systems, etc.  APP Language Selection: English, French, German, Russian, Japanese, Korean, Spanish, Chinese, Traditional Chinese (Only supports Chinese and English in offline state)    Specifications:  Plug Type: AU / EU / US / UK (Optional)  Material: ABS  Power Supply: AC230, 50Hz (EU) / AC120V, 60Hz (US)  APP Name: Tuya  OS Requirement: Compatible with iOS and Android system  Range: pH: 0.00~14.00pH              Salinity: 0~199.9ppt              Temperature: 0~50& 8451; (32~122& 8457;)  Resolution: pH: 0.01pH                     Salinity: 1ppm(1000ppm), 0.1ppt                     Temperature: 0.1& 8451;(0.2& 8457;)  Accuracy: pH: ±0.1pH                  Salinity: ±2%F.S                  Temperature: ±1.0& 8451;  Alarm Setting Range: pH: 0.00~14.00pH                                   Salinity: 0~20000ppm  Temperature Compensation: 0~50& 8451; (32~122& 8457;)  Operating Temperature: 0~50& 8451; (32~122& 8457;)  Length of Sensor Line: 2m / 6.56ft     pH/ORP/TEMP Controller Size: 160 * 95 * 40mm / 6.30 * 3.74 * 1.57in (Excluding Electrode Connector)  Control Socket Size: 130 * 65 * 53mm / 5.12 * 2.56 * 2.09in (Including Fuse)  Item Weight: 869g / 1.92lb  Package Weight: 1071g / 2.36lb  Package Size: 32 * 20.5 * 7.6cm / 12.60 * 8.07 * 2.