Clear Digital Display: The LCD screen shows measurement values clearly and in real time, allowing you to quickly read pH data even in low-light environments, which is ideal for both home and professional use. Wide Measuring Range 0-14 pH: This high pH meter pen offers a full 0-14 pH measuring range, suitable for testing acidity and alkalinity in a wide variety of water quality applications, from aquariums and swimming pools to hydroponics and drinking water. Portable Pen Design: The compact pen-style body is and easy to carry in a pocket or toolbox. Its ergonomic design makes one-handed operation comfortable and convenient, suitable for on-site and outdoor pH testing. Water Quality Tester for Multiple Uses: Designed as a versatile water quality tester, this device is perfect for aquariums, swimming pools, spas, hydroponic systems, fish tanks, drinking water, RO systems, laboratories, schools, and industrial water treatment., Weight: 0.1763698096 Pounds, Manufacturer: Xnuiasqe