Description Application: Ideal for residential or commercial use, water, pool, spas, liquid food, laboratory, aquaculture and hydroponics Easy Calibration: Advanced technology makes the test result fast and accurate; LCD screen makes reading clearly Features: Pocket size, lightweight, backlit function, high quality ATC Function: With Automatic Temperature Compensation (ATC), adjust to water temperature and give pH reading almost instantly What You Get: pH meter, user manual, 2 x 1.5V button cells (built in), 3 x pH buffer powders