Features: Measuring range: 0-4000ppb / 0-4.000ppm, resolution 1ppb/0.001ppm. High precision hydrogen meter with high sensitivity probe. Backlit display, data hold function. Easy to operate and carry. Simple electrode replacement. ATC symbol indicates automatic temperature compensation mode. IP67 rated for waterproof and dustproof protection, resistant to dust intrusion and short-term immersion. Ideal for testing water, swimming pools, aquariums, spas, hydroponics, laboratories, and drinking water. Specifications: Material: ABS. Size: 183x37mm / 7.2x1.46in. Button battery included. Note: Please allow 1-3cm error due to manual measurement. Please ensure you are comfortable with this before purchasing. Due to differences between monitors, the image may not reflect the actual color of the item. Package includes: 1x Hydrogen Meter