From the product description, check product page for current description, price and availability:

• Ideal for residential or commercial use, water, pool, spas, liquid food, laboratory, aquaculture and hydroponics.
• Advanced technology makes the test result fast and accurate.Easy calibration (pH4.00, pH6.86).
• Pocket size, lightweight, high quality.
• With Automatic Temperature Compensation (ATC). Adjust to water temperature and give pH reading almost instantly.
• What You Get: VIVOSUN pH meter, user manual, 2 x 1.5V button cells (built in), 3 x pH buffer powders, 1-year warranty and friendly customer service.