High Quality 3 In1 Function Portable Pen  Digital TDS & EC &TEMP Meter Filter Measuring Water Quality Purity Tester

specifications
range: EC:0~19990us/cm
         TDS: 0~19990ppm
         temperature:-50C-70C(-58 F-158F)
Resolution: EC:10us/cm
                     TDS: 10ppm
                    temperature:0.1C(0.2F)
accuracy : EC/ TDS ±2%F.S
              temperature:±0.1C(±0.2F)
battery: 4*1.5v(AG13)  not included
temperature compensation :0C~50C
dimensions: 188mm* 35mm *35mm
weight: 80g
note : this product without retail box ， thanks