Yaheetech LCD Digital TDS3 TDS Meter Filter Pen Temp PPM Tester Stick Water Purity Durable PVC construction, comfortable to hold Ideal for monitoring water, liquid, drink quality Perfect for laboratory, aquaculture, food processing, hydroponics or daily use like teaching Temperature Testing Range: 0~80 PPM Testing Range: 0~9990PPM Auto temperature compensation with the accuracy of 0.1 degree