Digital pH Meter for Water Testing Hanna HI98107 is a reliable and rugged tester suitable for both lab and field use. This Portable pH Tester is only 0.7″ thick and ergonomically designed to fit comfortably in your hand. It features a simple two-button operation for easy calibration and power control. With a renewable cloth junction, this Ergonomic Digital pH Tester offers extended life, ensuring accurate and consistent pH measurements even in highly contaminated samples. Applications: Agriculture,  Swimming pools and Fish farming, Food manufacturing and Quality control,The printing industry.