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. Product Notes: Please allow a little manual errors.Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please confirm acceptance before ordering. About Shipping: Please ensure your shipping informations are correct to avoid delivery issues. All orders are shipped within 3 days after payment. Delivery usually takes 8–12 days, The specific delivery time is depend on circumstances. If you have any questions during your purchase, feel free to contact us. We will respond you within 24 hours.