Multi-range pocket TDS tester consists 3 points calibration system.The battery indicator shows the remaining battery capacity. platinum sensor provides fast and reliable results.  It can measure TDS content of all liquids and low, mid, high concentration solutions.It has reset features also.TDS range=0-20-ppt; TDS accuracy=plusmn-± 1 % F.S.; TDS factor=0-1-to 0-5; Calibration points=1-3-points; TDS type range=low,mid and high;Shop Online at Labtron.us