Features:<br> Measuring range: 0-4000ppb /0-4.000ppm, resolution 1ppb/0.001ppm.<br> High precision hydrogen meter with high sensitivity probe. with backlight, data hold function.<br> Easy to operate,carry. Easy to change electrode. ATC symbol indicates that the instrument is in automatic temperature compensation mode.<br> IP67 is an international waterproof and dustproof certification. for Protection against dust intrusion, short-time immersion.<br> for Ideal for testing water, swimming pools, aquariums, spas, hydroponics, laboratory, and drinking water, etc.<br> <br> Specifications:<br> Material: ABS<br> Size: 183x37mm/7.2x1.46in<br> Button battery: included<br> <br> Note:<br> Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid.<br> Due to the difference between different monitors, the picture may not reflect the actual color of the item.<br> <br> Package includes:<br> 1x Hydrogen Meter