Hanna Instruments HI98130 Waterproof Combo Meter accurately measures pH, conductivity (EC), TDS, and temperature in one compact device. Featuring a floating waterproof design, replaceable pH electrode, reliable graphite conductivity sensor, and automatic temperature compensation. LCD displays clear, stable readings with selectable EC-to-TDS conversion and battery-saving auto shut-off. Perfect for home use, hydroponics, aquariums, pools, and ponds.