The Bluelab® pH Meter is used to accurately measure the pH value of a solution. Simply place the probe into the solution and the reading will be displayed on the screen. As the meter is portable and does not need a power supply to operate, it can be used anywhere and anytime to help you manage your crops' daily nutrient requirements. Calibration is simple with the push buttons on the meter and fresh Bluelab® calibration solutions. Supplied with double junction Bluelab® pH probe, 20 ml solution sachets and batteries. Range: 0.0 – 14.0 pH. Resolution: 0.1 pH. Accuracy @ 25°C: ±0.1 pH. Power Source: 2 x AAA batteries included. Features: auto turn off, low battery indicator, over range and under range indicators, portable.