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 is accurate, easy to use, and portable, making it ideal for ensuring the quality of drinking water rich in hydrogen ions. 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 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. Other information Package Contents: 4 x Digital Pool Water Tester Note: