1、The WiFi online pH TDS controller allows you to real time detector the pH and TDS via your smartphone on the APP, it is compatible with for ios and for Android system, great for 24 hours online monitoring. 2、Widely used to test the pH / Temperature / TDS (Total Dissolved Solids) of water. 3、With relay output power socket, you can control the pH value according to your requirements. 4、Test the TDS with both PPT and PPM units at will. 5、With power plug for air outlet stone, oxygen pumps, carbon dioxide regulators, solenoid valves and other pH control devices. 6、Easy calibration of pH/TDS with just a mini screwdriver and automatic temperature compensation. 7、Clear LCD with backlight, 3 results displayed simultaneously. Easy to use and provide precise display of results. Specifications: Material: ABS OS Requirement: Compatible with for iOS and for Android system Range: pH: 0.00~14.00pH TDS: 0~19990ppm, 0~199.0ppt Temperature: 0~50℃ (32~122℉) Resolution: pH: 0.01pH TDS: 1ppm(<1000ppm), 10ppm(>1000ppm), 0.1ppt Temperature: 0.1℃(0.2℉) Accuracy: pH: ±0.1pH TDS: ±2%F.S Temperature: ±1.0℃ Alarm Setting Range: pH: 0.00~14.00pH TDS: 0~20000ppm Temperature Compensation: 0~50℃ (32~122℉) Operating Temperature: 0~50℃ (32~122℉) 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 Fuses) Item Weight: 872g / 1.92oz Package Weight: 1077g / 2.38lb 1 * 3 in 1 Water Quality Tester with TDS Electrode 1 * pH Electrode 1 * Temperature Electrode 2 * Suction Cup 4 * Screw 4 * Anchor Bolt 1 * User Manual (English)