1. Features: - Measuring range: 0 - 4000ppb / 0 - 4.000ppm with a resolution of 1ppb / 0.001ppm. - High - precision hydrogen gas analyzer equipped with a high - sensitivity probe, featuring backlight and data hold functions. - Easy to operate and carry, and the electrodes are easy to replace. The “ATC” mark indicates that the instrument is in the automatic temperature compensation mode. - IP67 is an international waterproof and dust - proof certification, which can prevent dust intrusion and short - time immersion. - Suitable for detecting water, swimming pools, aquariums, hot spring baths, hydroponic plants, laboratories, and drinking water, etc. 2. Packaging contents: - One hydrogen gas analyzer. 3. Specifications: - Material: ABS - Dimensions: 183x37mm / 7.2x1.46 inches - Includes a button battery. 4. Notes: - Due to manual measurement, an error of 1 - 3 cm is allowed. Please ensure that you don't mind this error before placing a bid. - Due to differences between different monitors, the pictures may not reflect the actual color of the item.