Features: Measuring range: 0-4000ppb / 0-4.000ppm, resolution 1ppb/0.001ppm. High precision hydrogen meter with high sensitivity probe. Features backlight and 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, guarding against dust 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. Due to differences in monitor displays, the image may not reflect the actual color of the item. Package includes: 1x Hydrogen Meter