Product Description: The PH-20 PH test stick is a portable direct-reading device for rapid water acidity and alkalinity detection, featuring automatic temperature compensation. It requires no complex instruments—simply immerse it in liquid to power on and read automatically, ensuring easy and quick operation. With a lightweight, long-rod design, it is suitable for multiple scenarios such as aquarium farming, water quality testing, beverage preparation, simple pH screening in laboratories, and daily chemical solution testing. Utilizing a two-point standard buffer calibration method, it delivers stable and reliable measurements. Equipped with an auto-off power-saving mechanism and powered by replaceable AA batteries, it offers convenient endurance. The included dedicated electrode maintenance solution tackles various contaminants like scale, grease, and protein residues, extending its lifespan and making it ideal for frequent daily pH testing. PH-20 PH Test Pen Main Technical Specifications Measuring Range 1.0–11.9pH Accuracy ±0.1pH Resolution 0.1pH Operating Temperature 0°C–50°C Automatic Temperature Compensation 0°C–50°C Battery 2×1.5V (AA Batteries) Dimensions 425mm x 39mm Weight 260g