Fangrui Product Details Professional Com-100 Ec Analyzer Tds Meter Temp Tester With Automatic Calibration And Data Hold Measurement Tools For Pool Ec Range: 0 - 9990 S; 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:0-99:0.1s;0-999:1s;1000-990:10s;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: +/- 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.