General description The YY-400 Hydrogen Ion Concentration Water Quality Test Pen is a high-precision multifunctional tester designed to measure pH, ORP, hydrogen ion concentration, and temperature in various water types. It features automatic temperature compensation for accurate readings between 0-60°C, making it user-friendly and portable for health-conscious individuals. Technical specifications pH Range: 0.01-14.00pH pH Resolution: 0.01pH pH Accuracy: ± 0.05pH ORP Range: ± 999mV ORP Resolution: 1mV ORP Accuracy: ± 2mV H2 Range: 0-2400ppb; 0.001 to 2.400 H2 Resolution: 2ppb; 2 ppm H2 Accuracy: ± 10ppb; ± 10 ppm Temperature Range: 0.1-60.0°C (32.0-140°F) Temperature Resolution: 1℃/°F Temperature Accuracy: ±0.5 Size: 183 x 37 x 37mm Material: Plastic Color: Black + White Compatibility and accessories Suitable for testing household and laboratory water, including swimming pools, ponds, beer, kombucha, aquariums, hydroponics, laboratories, and food processing. Package Contents: 2 x