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. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. 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 make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!