It can be used to test pH, TDS, EC and TEMP of water. Test range: pH: 0.01 to 14.00 pH, EC: 1 to 19999 s/cm, TDS: 1 to 19999 ppm Easy to use and read the digits, convenient to use. You can visually get the pH value of the water you are measuring from the screen The backlit LCD display makes it easy to read the displayed values Suitable for water sources, aquariums, hydroponics, swimming pools, and other water systems Specification: Measuring range: pH: Range: 0.01-14.00ph, Resolution: 0.01ph, Accuracy: 0.05pH, TDS: 1-19990ppm, EC: 0-19990s/cm Automatic calibration: EC: automatic calibration (1413uS/cm, 12.88mS/cm, 111.8mS/cm), pH: automatic identification solution (6.86/4.00/9.18) (If the solution cannot be recognized, please replace the electrode or contact customer service.) Temperature: ATC 0-60C Application Environment: 0 to 60.0"C (32.0-140F ), RH 100% Battery: 3*1.5V (LR44) (not included) TDS factor: 0.5 Screen size: 33*24mm Temperature range: 0.1-60.0C 32.0-140*F Size: 18.5x3.8cm Weight: 90g(3.2oz2) Accuracy: 0.5C Resolution: 0.1C/*F Waterproof grade: IP67 Automatic shutdown: 5 minutes Note: The electrodes need to be cleaned after use. Package included: 1 x 4-in-1 Multifunctional PH/EC/TDS/Temp Meter 1 x English User Manual 3 x PH Buffer Powder