Overview: Measuring range: 0~1999 PPm (mg/L) Resolution: 1mg/l (ppm) Accuracy: ±2%F.SPocket sized & feather-weight for portable use in a large number of applications such as water quality testing etc. Built-in 2 x CR2032 batteries included Package included:1 x TDS tester 1 x 1382ppm calibration solution 1 x Screwdriver 1 x Chinese/ English manual Specification: Weight Approx:83.7g Size Approx:15.5 x 2.5 x 2