Specification:  PH range: 0.0~14.0 PH  PH accuracy: ± 0.05PH   Stability: ±0.03  Tested solution temperature compensation range: 0~60°C   Solution temperature compensation range: 0~70°C   Battery: 4*LR44 1.5V button cell (not included)  Automatic temperature compensation: yes   Display: LCD with backlight  Waterproof level: IP65  Working temperature: 0~50°C   Working humidity: ≤85%RH  Color: grey  Material: ABS  Dimension:250*100*60mm    Package list:  1*PH meter  1*carry bag  1*English user manual    Descriptions:  << Automatic temperature compensation: With ATC function, makes your measurement more precise and quick.  << Clear reading: LCD screen with backlight allows you high visibility and readability even in dark room.  << Backlight display: When the PH is lower than 3.5PH, red backlight indication means the liquid has strong acid. And the PH is higher than 12.5PH, red backlight indication displays and the liquid has strong basicity.  << Waterproof: IP65 water proof level, easy to operate.  << Display: The item will display PH and temperature, dual display function.  << Auto-calibration: One touch auto-calibration up to 3 points, easy steps to operate.  << Power off: With auto power off and manual power off function, protect your PH meter to prolong the lifespan of it.  << Temperature unit selectable: ° and ° are switchable easily.  << Application: Designed for drinking water, aquaculture water, domestic water test and so on.    Notes:  1. Please allowed 1-3mm differences due to manual measurement, thank you  2. Due to the difference between different monitors, please understand that the picture may not reflect the actual color of the item.