Usage Tips:7 in 1PH 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 is designed with a 7-in-1 function,Simply press the {MODE/CAL} key,you can switch to measure TDS/EC/Salinity/Temp/ORP/S. G/PH •LCD Display: The screen of the digital water meter adopts LCD,which clearly displays the data with backlight •High Accuracy PH Tester: The digital water quality meter's high precision algorithm chip and electrodes ensure accurate and quick response. Once the reading has stabilized,simply press the HOLD/TEMP button to lock the reading and take it out for viewing •IP67 Waterproof Grade: Prevent dust and soak for a short time,(Can be used even if dropped into an aquarium). The glass bulb at the tip of the PH pen is easily broken,so please be careful when using it or drying it •Wide Application: The 7-in-1 ph tester digital is suitable for testing household drinking water,hydroponics,swimming pools,aquariums,laboratories,etc. The salinity tester has multiple uses,not only detecting the salt content of edible salt,saltwater ponds,and koi ponds,but also detecting the salinity of seawater,oceans,and saltwater fish ponds Specifications: •Material: Plastic •EC measurement range: 0 to 10000uS/cm 10.01-19.99ms 20.1-400 mS/CM •Resolution: 1uS/cm; 0.1 milliseconds/cm •Accuracy: ± 2% of the reading •TDS measurement range: 0 to 1000ppm,1000ppm to 10000ppm,10.1 to 200.0ppt •Resolution: 1ppm •Accuracy: ± 2% of the reading •Salinity measurement range: 0.00 to 25.00% •Resolution: 0.01% •Accuracy: 0.01-5.00% (± 0.1%) 5.10-25.00% (± 1%) •PH measurement range: 0.01-14.00ph •Resolution: 0.01pH •Accuracy: ± 0.05ph •ORP measurement range: 0~± 999mV •SG: Measurement range: 1000~1222 •Working environment: 0 to 60.0 ° C (32.0-140 ° F); Relative humidity 100% •TDS coefficient: 0.4 to 1.0 •Temperature range: 0.1-60.0 ° C 32.0-140 ° F •Temperature accuracy: ± 0.5° C •Temperature resolution: 0.1° C/° F •Power supply: 3 x1.5lr44 button battery,150mAh •Display size: 33 * 24mm •Size: 183 * 37 * 37 millimeters (7.2 * 1.5 * 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