Features1A water quality test pen that can measure four parameters: total dissolved solids (TDS), electrical conductivity (EC), salinity, and temperature. 2Multi?function detection mode, simple and convenient function switching, clear reading. 3High performance, portable ergonomic design, fast measurement, high stability. 4The size is 188mm35mm35mm, it is light, convenient to store and carry. 5 workmanship, long service life, can provides precise measurement.SpecificationCondition:Item Type: Water Quality TesterBattery Attributes: 3 x 1.5V button battery LR44 150MAH (not included )Technical Index:Range: pH 0.00-14.00 pHEC 0-19990us/cm 0-19.9ms/cmTDS 0-19990ppm0-19.9pptTemperature 0 DegreeC-50 DegreeC (32 DegreeF-122 DegreeF)Resolution: pH 0.01PHEC 1us / cm ( 1999us / cm)0.1 ms/cmTDS 1 ppm ( 1999ppm)0.1ppt Temperature 0.1 DegreeC (0.2 DegreeF)Accuracy: pH0.03 pHEC TDS2F.STemperature 1Temperature Compensation: 0 DegreeC-50 DegreeCWorking Temperature: 0 DegreeC-50 DegreeCSize: Approx. 188 x 35 x 35mm / 7.4 x 1.4 x 1.4inPackage List1 x Detector 1 x Screwdriver 1 x Manual