The HI98121 is a reliable, waterproof tester that ensures quick and easy measurements of both pH and ORP. This accurate pH and ORP tester feature 0.01 pH resolution with automatic two-point calibration and temperature compensation in a single, portable, pocket device. No more switching between meters for your routine measurements.

• ±0.05 pH/ ±2 mV Accuracy
• Replaceable pH Electrode
• Great for pools, sanitizers, wastewater, & industrial.