Accurate and Reliable: Equipped with alloy electrode probe, this TDS meter ensures high precision in measuring water quality with a range of 0-9990 PPM. Ideal for both household and professional use. Easy to Read: Features a clear LCD display that shows measurements in PPM (parts per million), allowing you to quickly assess water purity levels. Portable Design: Compact and , this water quality testing pen is perfect for on-the-go testing in various settings such as homes, schools, aquariums, and pools. Versatile Use: Suitable for testing drinking water, aquariums, pools, spas, and hydroponics to the safety and health of water consumed or used. Color: Blue Material: plastic+metal Package Contents: 3 x Water quality test pens 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.