Professional COM-100 EC Analyzer TDS Meter Temp Tester With Automatic Calibration And Data Hold Measurement Tools For pool EC Range: 0 - 9990 µS; 0 - 9.99 mS TDS Range: 0 - 8560 ppm (mg/L)0.7(442)scale; 0 - 8.56 ppt:0.7(442)scale,0-500PPT;(NACI)scale 0-5000ppm(mg/L);0.5(NACL)scale Temperature Range: 0-55 °C; 32-130 °F Resolution: EC:0-99:0.1µS;0-999:1µS;1000-990:10µS;0-9.99ms:0.01ms TDS:0-99:0.1ppm;100-999:1ppm;1000-9990:10ppm;1-8.56:0.01ppt Temp. resolution:0.1 °C/F Accuracy: +/- 2% Calibration: Digital calibration by push button. Power source: 2pcs AAA Battery(Not included). Colour: As Shown Material: Plastic Package Contents: 1*water quality detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.