7 in 1 PH Meter Water Quality Tester PH/TDS/EC/ORP/S.G/Water Salinity/Temp Pen Tester - With Backlight 7 in 1 PH Meter: The pH meter features a 7-in-1 function. Simply press the {MODE/CAL} key to switch between measuring TDS, EC, Salinity, Temp, ORP, S.G, and PH LCD Display: The digital water meter has an LCD screen with backlight for clear data visibility High Accuracy PH Tester: Equipped with a high precision algorithm chip and electrodes for accurate and fast response. Press the HOLD/TEMP button to lock the reading once stabilized IP67 Waterproof Grade: Dustproof and resistant to short-term immersion (can be used if accidentally dropped into an aquarium). The glass bulb at the tip is fragile; handle with care during use and drying Wide Application: Suitable for testing household drinking water, hydroponics, swimming pools, aquariums, and laboratories. The salinity tester can measure salt content in edible salt, saltwater ponds, koi ponds, seawater, oceans, and saltwater fish ponds Specifications: Material: Plastic EC measurement range: 0 to 10000 uS/cm, 10.01-19.99 mS, 20.1-400 mS/cm Resolution: 1 uS/cm; 0.1 mS/cm Accuracy: ±2% of reading TDS measurement range: 0 to 1000 ppm, 1000 ppm to 10000 ppm, 10.1 to 200.0 ppt Resolution: 1 ppm Accuracy: ±2% of reading Salinity measurement range: 0.00 to 25.00% Resolution: 0.01% Accuracy: ±0.1% (0.01-5.00%), ±1% (5.10-25.00%) PH measurement range: 0.01 to 14.00 pH Resolution: 0.01 pH Accuracy: ±0.05 pH ORP measurement range: 0 to 999 mV SG measurement range: 1000 to 1222 Working environment: 0 to 60.0°C (32.0 to 140°F); Relative humidity 100% TDS coefficient: 0.4 to 1.0 Temperature range: 0.1 to 60.0°C (32.0 to 140°F) Temperature accuracy: ±0.5°C Temperature resolution: 0.1°C/°F Power supply: 3 x 1.5V LR44 button batteries, 150 mAh Display size: 33 x 24 mm Dimensions: 183 x 37 x 37 mm (7.2 x 1.5 x 1.5 inches) Weight: 105 grams (3.2 ounces) Package included: 1 x Water Quality Tester 4 x Correction Powder 1 x English User Manual Other items not included