Features: brand new and high quality Easy to operate, carry. Easy to change electrode. ATC symbol appears in the lower-left corner of the display, indicating that the instrument is in automatic temperature compensation mode. Sensing technology automatically turns on or turns off the LCD screen backlight to react to ambient light levels. Auto power off if no operation in 10 minutes. Products are widely used in environmental for protection, food, sanitation, geological prospecting,metallurgy, surface water,industrial wastewater, drinking water, acid rain and other detection. Dissolved hydrogen testing range: 0-1999 Ppb/0-1.99 Ppm. Low power indicate. Auto on/off backlight. Specifications: Material: ABS Size: 207x36mm/ 8.15x1.42 in Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Hydrogen Meter ( battery excluded)