SPECIFICATION: pH range: 2.00~12.00 pH accuracy: ±0.1 pH resolution: 0.01 Conductivity Range: 0~199.9, 0~1999uS/cm; 0~19.99, 0~69.99mS/cm Conductivity Accuracy: ±1% FS ±1 digit Conductivity Resolution: 0.1uS/cm, 1uS/cm; 0.01mS/cm, 0.1mS/cm Salinity range: 0~10.00ppt; 0~42.0ppt (sea water) Salinity accuracy: ±1% FS ±1 digit Salinity resolution: 0.01 ppt, 0.1ppt TDS. Range: 0~199.9f, 0~1999*f ppm; 0~19.99*f, 0~150.0*f ppt TDS. Accuracy: 0.1,1ppm, 0.01,0.1ppt/ ±1% FS ±1 digit TDS Factor: 0.30~1.00 DO range: 0.0~199.9% (0.0~30.0mg/L) DO accuracy: ±3% FS ±1 digit DO resolution: 0.1 Temperature range: 0~60.0℃ Temperature accuracy: ±0.5℃ Temperature resolution: 0.1 Probe type: PH probe/conductivity probe/dissolved oxygen probe LCD size (mm): 32.5 (H) x54 (W) Working temperature and relative humidity: 0~50℃, Humidity<80% Storage temperature and relative humidity: -20℃~60℃, Humidity<90% Product Size (mm): 169 (L) x 78.3 (W) x 43.4 (H) Product Weight: 200g Package size: 42*32*8cm Package gross weight: 2.7kg Power supply: 6PCS AAA battery (without battery) Line length: Dissolved oxygen probe line 2.85 meters; PH value probe/conductivity probe line 1.4 meters FEATURES: 1. Simultaneous measurement of PH/conductivity (TDS and salinity)/dissolved oxygen/temperature, large screen can display multiple parameters at the same time, water quality is clear at a glance 2. Rugged and durable, beautiful appearance, IP67 waterproof rating 3. With automatic temperature compensation function, multi-point correction function (PH value 3 points, dissolved oxygen 2 points, conductivity 4 points), dissolved oxygen has a manual height compensation function 4. Can store 99 points of data, and data playback 5. Temperature convertion (℃/℉) 6. Automatic shutdown (1 hour)