Features: Ensure safety of your drinking water with our high precise TDS Water Quality Tester Pen, design to quickly and accurately measure total dissolved solids (TDS) level. Featuring a user friendly design, this pen requires no professional knowledge—simply immerses the probes in water for real time data on a clearly digital display. Ideal for family concerned about drinking water safety, aquariums enthusiasts maintaining fish health, outdoor adventurers needing reliable water sources, and professional in water treatments industry. Perfect for home use to monitor tap or bottled water quality, managing swimming pool cleanliness, maintaining aquariums environment, and testing natural water sources during travel. With its lightweight design, this TDS meter is builts for convenience and durability, offering automatic calibration and waterproof features to ensure accurate result every time. Specifications: Component:Plastic Length:Approx.14cm/5.51inch Tasting Ranges:0-9999ppm Battery:2x1.5V(LR44) Package Includes: 1pc Water Quality Tester note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.