Features Multi-parameter floating Bluetooth monitor MV/PH/TDS/EC/SALT/%///&Temp Multi-function water quality tester Suitable for measuring dissolved oxygen in water for aquaculture, environmental protection, tap water source monitoring, sewage treatment, paddy fields, and scientific research institutions. Mobile Bluetooth App This instrument features a Bluetooth and app compatible with both IOS and Android systems. Switch your phone's language and region to automatically convert different words on the app. Large LCD Display Large, multi-functional, high-definition LCD display. Clear, clear, and accurate. Type: Multi-Parameter Water Quality Analyzer Measurements: pH, Salinity, Other Industries: Hospitals, Swimming Pools, Aquaculture Power: Built-in Battery Detection Range: pH: 0.00-14.00pH ORP: -2000V to +2000V : 0.1-3.0mg/L EC: 0-19900s/cm 0-199.0s/cm : 0-199.00s/cm TDS: 0-19900ppm 0-199.0ppt SALT: 0-199.0ppt 0%-20% S.G.: 0.990-1.400 Accuracy: pH: 0.03pH ORP 5mV EC: 2%F.S : 2%F.S TDS: 2%F.S SALT: 2%F.S Temperature: 1.0C Temperature: 0C-50C (32F-122F) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.