With its lightweight design, this meter is builts for convenience and durability, offering automatic calibration and waterproof features to ensures accurate result every time Ensures of your drinking water with our high precise Water Tester Pen, design to quickly and accurately measure total dissolved solids levels Perfect for home use to monitor tap or bottled water, managing swimming pool cleanliness, maintaining aquariums environment, and testing natural water sources during travel Ideal for family concerned about drinking water, aquariums enthusiasts maintaining fish health, outdoor adventurers needing reliability water sources, and professional in water industry Featuring a user friendly design, this pen requires not professional knowledge—simply immerses the probes in water for real time data on a clearly digital display, Manufacturer: ERRORY